botany
& gardening |
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raceme
: a variety of flower cluster (inflorescence) in which single
flowers grow individually on short stalks arranged at equal
intervals along an elongated stem, as in the lily of the valley.
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botany
& gardening |
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rachis
: the axis or main stem of an inflorescence or of a compound leaf; a
branch that proceeds nearly in a straight line from the base to the
apex of a raceme.
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radian
(rad or rd) :
the SI unit of plane angle, is the plane angle between two radii of
a circle which cut off on the circumference an arc equal in length
to the radius. Since the circumference of a circle is 2π
times the radius, the complete plane angle about a point is 2π
rad.
NOTE:
The degree and its decimal submultiples can be used with the SI when
the radian is not a convenient unit; by definition, 2π rad = 360o.
The minute (1' = (1/60)o) and the second (1" =
(1/60)') can also be used.
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rancor
: bitter feeling or ill will; the deepest malignity
or spite; deep-seated enmity or malice; inveterate hatred.
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botany
& gardening |
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receptacle
: the enlarged upper part of a stalk bearing a flower or an
inflorescence.
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adj. |
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reluctant
: unwilling, grudging one's consent, opposed in mind.
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economics |
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rent
: the income accruing to the owner for the service of a durable good
such as a piece of land or a property. |
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durable
goods |
computing
& web acronym |
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RGB
: red, green, blue; see RGB color model, RGB color space |
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computing
& web |
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RGB
color model : an additive color model in which red,
green, and blue light are the three primary colors. RGB is a
convenient color model for computer graphics because the human
visual system works in a way that is similar - though not quite
identical - to an RGB color space. For the 24 bit color depth, each
of RGB parameters (primary colors) can use a value ranging from 0
(no light, black) to 255 (full intensity of the colored light). For
example, a bright red color might have an R value of 246, G value of
20, and B value of 50. Combining two additive primary colors in
equal intensities produces the additive secondary colors cyan,
magenta, and yellow. Combining all three primary lights (colors) in
equal intensities produces a shade of gray; when the value of all
three parameters is 255, the result is pure white; when all three
parameters have values of 0, the result is pure black. Varying the
full range of intensity of each light (color) eventually reveals the
full gamut of those three lights (colors). |
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color
model
color
space
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computing
& web |
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RGB
color space : any additive color space based on the RGB
color model; RGB spaces are specified by defining three primary
colors and a white point. Note that the RGB color model itself does
not define what exactly is meant by "red",
"green" and "blue", so that actual color spaces
can vary considerably. As of 2004, sRGB is by far the
most commonly used RGB color space, particularly in consumer grade
digital cameras, because it is considered adequate for most consumer
applications, and its design simplifies previewing on the typical
computer display. Adobe RGB, which has a significantly larger gamut
than sRGB, is also being built into more medium-range digital
cameras, and is favored by many professional graphic artists. |
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color
model
color
space
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botany
& gardening |
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rhizome
: a creeping, underground stem, usually horizontally elongated,
sending out roots from its lower surface and sending up leafy shoots
or flowering stems from its upper surface. |
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geography
: navigation |
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rhumb
: a point of the compass; also a rhumb line. |
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geography
: navigation |
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rhumb
line (also called rhumb, loxodrome)
: a curve on the surface of a sphere that cuts all meridians at the
same angle. It is the path taken by a vessel or aircraft that
maintains a constant compass direction. |
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riddle
: a statement or question having a double or veiled
meaning, put forth as a puzzle to be solved. Riddles are of two
types: enigmas, which are problems generally expressed in
metaphorical or allegorical language that require ingenuity and
careful thinking for their solution, and conundrums, which are
questions relying for their effects on punning in either the
question or the answer. |
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botany
& gardening |
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rind
: a thick and firm outer coat or covering, as of certain fruits,
cheeses, and meets: watermelon rind, orange rind, bacon rind; the
bark of a tree. |
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Latin
acronym |
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RIP
: requiescat in pace : may he (or she) rest in peace |
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ripple
: a small wave or series of waves. |
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petrology |
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rock
: a consolidated aggregate, naturally occurring, of mineral grains consisting of one or
more mineral species (minerals and/or mineraloids) and having some degree of chemical and
mineralogic constancy. Rocks are classified by mineral and chemical
composition; the texture of the constituent particles; and also by
the processes that formed them. |
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popular |
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rock
: a hard, compact object with some coherence, derived from the Earth’s
solid components. |
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rookery
: a colony of breeding animals. The
term is most commonly applied to the nesting place of birds, such as
the crow and rook, a bird similar to the crow, but smaller; it is
also used to describe the breeding grounds of the penguin and
seabirds in general. A rookery may also be a
place where marine mammals such as the seal, sea lion, and walrus
breed, give birth, and nurse their young, such as a beach or similar
location. A turtle rookery is typically a beach where the adult
female nests and buries her eggs. |
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botany
& gardening |
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rosette
: a circular cluster of leaves, petals, or other organs on an axis
with very short internodes. |
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Internet
lingo |
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ROTFL
: rolling on the floor laughing |
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acronym |
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RTECS
: Registry of Toxic Effects of Chemical Substances,
by National Institute for Occupational Safety and Health (NIOSH). |
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botany
& gardening |
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runcinate : sharply incised or
saw-toothed leaves with the segments directed backward; pinnatifid,
with the lobes convex before and straight behind, pointing backward,
like the teeth of a doule saw, as in the dandelion leaf. |
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computing
& web acronym |
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RYB
: red, yellow, blue; see RYB color model; |
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RYB
color model : a subtractive color model in which red,
yellow, and blue are primary colors; in it, green is a mixture of
blue and yellow, yellow is the complement of violet and orange is
the complement of blue. Nowadays it is known that RYB model
generates rather incomplete gamut, but it continues to be in common
use in art, in spite of the CMY model success. |
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color
model
subtractive
color
color
gamut |
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