Lewis Short
lemma (noun N) = λῆμμα:
* A subject for consideration or explanation, a theme, matter, subject, contents (not ante-Aug.; in Cic. only written as Greek).
* Lit.: lemma sibi sumpsit, quod ego interdum versibus ludo,Plin. Ep. 4, 27, 3.
* Transf.
* The title of an epigram, because it indicates the subject: lemmata si quaeris, cur sint ascripta, docebo: Ut si malueris lemmata sola legas,Mart. 14, 2, 1; Aus. Parent. praef.
* The epigram itself: si mihi ex hoc ipso lemmate secundus versus occurrerit,Plin. Ep. 4, 27, 3: consumpta est uno si lemmate pagina, transis,Mart. 10, 59, 1.
* A story, tale: nutricis lemmata,nursery-tales,Aus. Ep. 16, 90.
* The assumption or lemma of a syllogism: est vitium insidiosum et sub falsa lemmatis specie latens,Gell. 9, 16, 7; v. sumptio.
Charlton T. Lewis, Charles Short, A Latin Dictionary