Bailly
ου (τὸ) [ᾰ] dim. de ψύδραξ, DIOSC. 5, 126.
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LSJ
τό, pimple, τὰ ἐν κεφαλῇ Dsc. 5.109, cf. Damocr. ap. Gal. 13.945; on the eyelid, stye, Cyran. 35; on the nose, said to be caused by telling a lie, Sch. Theoc. 12.24; cf. ψεῦσμα II.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)