One of the mysteries of the English language finally explained.
Botany. A plant of the subfamily Prunoideae (also called Amygdaloideae) (family Rosaceae), comprising flowering plants and trees and including the plum and almond.
1Zoology. Designating or relating to a type of radiolarian (of the order Spumellaria) having a skeleton in the form of an ellipsoidal lattice (formerly classified in a suborder Prunoidea). Now rare.
2Botany. Of or relating to the subfamily Prunoideae (family Rosaceae) of flowering plants and trees.
Late 19th century (in an earlier sense). From classical Latin prūnum plum + -oid.
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