Liddell–Scott–Jones: κέστρος

κέστρος,ὁ,

A. sharpnessorroughness on the tongue, Hsch.

2. first sprout of seeds, Id.

II. bolt discharged from engines, invented in the war with Perseus, Plb. 27.11.1 (s.v.l.), D.H. 20.1 .