ακροβελής

From LSJ

αὐτὸν κέκρουκας τὸν βατῆρα τοῦ λόγου → you have struck the very threshold of the argument, you have struck the most important and chiefmost point

Source

Greek Monolingual

ἀκροβελής (-οῦς), -ές (Α)
αυτός που έχει μυτερό άκρο.
[ΕΤΥΜΟΛΟΓΙΑ < ἀκρο- (Ι) + -βελής < βέλος.