Pinon \Pi[~n]"on\, n. [Sp. pi[~n]on.] (Bot.) (a) The edible seed of several species of pine; also, the tree producing such seeds, as {Pinus Pinea} of Southern Europe, and {P. Parryana, cembroides, edulis, and monophylla}, the nut pines of Western North America. (b) See {Monkey's puzzle}. [Written also {pignon}.]