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R
Race (1) Biology. A Population within a species that differs in
one or more inherited characteristics from other populations
but not sufficiently distinct to rate as a Taxon (q. v.). (2) A
rapid movement of the tide through a narrow channel.
Rachion The line where waves break in lakes, the places where
wave action and undertow cause the greatest turmoil.
Rad The dose or unit of ionizing radiation absorbed by tissues
of an organism, equal to 100 ergs of energy per gram.
Radiation (1) The emission and transmission of energy from a
source, e.g., Ionizing radiation (q. v.), solar radiation by
electromagnetic waves such as light, x-rays, gamma-rays. (2)
See Adaptive radiation.
Radicle The lower end of the axis of the embryo in a seed and
which develops into a root during germination.

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Publication Information: Book Title: Dictionary of Ecology. Contributors: Herbert C. Hanson - author. Publisher: Philosophical Library. Place of Publication: New York. Publication Year: 1962. Page Number: 283.
    
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