Bailly
ας (ἡ) scammonée (Convolvulus scammonia L.) plante purgative, ARSTT. Probl. 1, 41, 43 ; DIOSC. 4, 171.
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LSJ
(and σκαμωνία), ἡ, scammony, Convolvulus, Scammonia, from the roots of which the purgative medicine Scammony is extracted, Eub. 19, Arist. Pr. 864a4, b13, Thphr. HP 4.5.1, 9.1.3, al., Dsc. 4.170; also σκαμμώνιον, τό, Nic. Al. 565; σκαμώνειον, Anon. Lond. 37.19; cf. ἀσκαμωνία, κάμων. [σκαμωνία Eub. l.c. ; the spelling with one μ is found also in Thphr. HP 9.1.4 codd., 9.9.1 codd., Sor. 1.125, Hsch., and as v.l. in Dsc. l.c. ; cf. σκαμώνειον ; but σκαμμώνιον is corroborated by the metre in Nic. l.c.]
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)