κέντρον
Alt. κέντρον, ου, τό,
Etym. κεντέω
1. "any sharp point":
1. "a horsegoad", Lat. stimulus, Il., etc.: also "an ox-goad", Plat.; —proverb., πρὸς κέντρα λακτίζειν, v. λακτίζω 2.
b. metaph. "a goad, spur, incentive", Aesch., Eur.
2. "an instrument of torture", Hdt.:—metaph. in pl. "tortures, pangs", Soph.
3. "the sting" of bees and wasps, Ar.; of a scorpion, Dem.; metaph. of the impression produced by Socrates, ὥσπερ μέλιττα τὸ κ. ἐγκαταλιπών Plat.
4. "the stationary point of a pair of compasses, the centre" of a circle, id=Plat.