- a combining form meaning “seed”; used with this meaning and as a combining form of sperm1 in the formation of compound words: spermatogonium.
Also especially before a vowel, spermat-.
Origin of spermato-
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
spermo- before a vowel spermat- or sperm-
- indicating spermspermatogenesis
- indicating seedspermatophyte
from Greek sperma, spermat-, seed; see sperm 1