ἔμβολον

Etymology
From, from +.

Noun

 * 1) wedge, peg, stopper
 * 2) bolt, bar
 * 3) architrave
 * 4) prow of warships (rammed into opposing ships)
 * 5)  The rostra, or tribune of the Latin forum
 * 6) wedge-shaped order of battle (Latin, )
 * 7) graft