a combining form meaning “seed”; used with this meaning and as a combining form of sperm 1 in the formation of compound words: spermatogonium. Also, esp. before a vowel,spermat-.Cf. sperm-, -sperm, -spermal, -spermic, spermo-, -spermous.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.