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From The Collaborative International Dictionary of English v.0.48:
Prunus \Pru"nus\, n. [L., a plum tree.] (Bot.) A genus of trees with perigynous rosaceous flowers, and a single two-ovuled carpel which usually becomes a drupe in ripening. [1913 Webster] Note: Originally, this genus was limited to the plums, then, by Linn[ae]us, was made to include the cherries and the apricot. Later botanists separated these into several genera, as Prunus, Cerasus, and Armeniaca, but now, by Bentham and Hooker, the plums, cherries, cherry laurels, peach, almond, and nectarine are all placed in Prunus. [1913 Webster] Prurience