"castrated person," early 15c., from Latin spado, from Greek spadōn "eunuch," which, according to Beekes, is related to spadix "(torn off) twig" and derived from span "pull out, pluck; tear away" (see spasm).
Entries linking to spado
spasm n.
late 14c., "sudden violent muscular contraction," from Old French spasme (13c.) and directly from Latin spasmus "a spasm," from Greek spasmos "a spasm, convulsion; wincing; violent movement," from span "draw (a sword, etc.), pull out, pluck; tear away, drag; suck in; slurp down; contract violently," which is perhaps from a PIE *(s)peh- "to draw, set in motion (violently)," hence "to stretch." The figurative sense of "a sudden convulsion" (of emotion, politics, etc.) is attested by 1817.