Primary-rainbow
noun
1.
the most commonly seen rainbow, formed by light rays that undergo a single internal reflection in a drop of water.
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primary reaction n. See vaccinia.
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noun, Botany. 1. the first root produced by a germinating seed, developing from the radicle of the embryo. primary root The first root of a plant, originating in the embryo. In gymnosperms, eudicotyledons, and magnoliids, the primary root develops into the taproot. In monocotyledons, the primary root disintegrates as the lateral roots develop into a […]
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noun 1. a school usually covering the first three or four years of elementary school and sometimes kindergarten. 2. elementary school. primary school noun 1. (in Britain) a school for children below the age of 11. It is usually divided into an infant and a junior section 2. (in the US and Canada) a school […]
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noun, Anatomy. 1. any of the body structures directly concerned in reproduction, as the testes, ovaries, and external genitalia.