Catkin

(n.) An ament; a species of inflorescence, consisting of a slender axis with many unisexual apetalous flowers along its sides, as in the willow and poplar, and (as to the staminate flowers) in the chestnut, oak, hickory, etc. -- so called from its resemblance to a cat's tail.

Thesaurus Entries

born fool, capitulum, catkin, clot, cone, congenital idiot, corymb, cretin, cyme, defective, golem, half-wit, head, idiot, imbecile, juggins, mongoloid idiot, moron, natural, natural idiot, natural-born fool, panicle, pine cone, raceme, simp, simpleton, spadix, spike, spikelet, strobile, thyrse, umbel, verticillaster, zany