διάφραγμα

ατος, τό
A. partition or barrier, Th. 1.133, Hero Spir. 1.8; στοᾶς Inscr.Prien. 99.19; lock in a canal, PPetr. 3p.343 (iii B.C.), D.S. 1.33.
II. muscle which divides the thorax from the abdomen, midriff, diaphragm, Pl. Ti. 70a, 84d, Gal. UP 4.14, etc.
b. δ. [τοῦ μυκτῆρος] cartilage which divides the nostrils, Arist. HA 492b16, cf. Ruf. Onom. 34, Gal. 17(1).824.
c. the velum palati, Hp. Epid. 2.2.24.
d. septum lucidum of the brain, Gal. 2.719.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
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