|prō+ adjective
Etymology: pro- (I) + cephalic
1. : relating to, forming, or situated on or near the front of the head
procephalic antennae
2.
[Greek prokephalos (from pro- pro- (I) + kephalē head) + English -ic — more at cephalic ]
of a dactylic hexameter : having actually or apparently an extra syllable at the beginning