κέστρος

A. sharpness or roughness 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.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project