Source : Webster's Revised Unabridged Dictionary (1913)

Proscolex \Pro*sco"lex\, n.; pl. {Proscolices}. [NL., fr. Gr. ?
   before + ?, ?, a worm.] (Zo["o]l.)
   An early larval form of a trematode worm; a redia. See
   {Redia}.