n.
Function: prefix
Etymology: New Latin, from Latin, from Greek, before, forward, forth, for, from pro ― more at FOR
1 a : earlier than : prior to : before < pro thalamion> b : rudimentary : PROT- < pro nucleus> c : precursory < pro insulin>
2 a : located in front of or at the front of : anterior to < pro cephalic> < pro ventriculus> b : front : anterior < pro thorax>
3 : projecting < pro gnathous>