τμῆ-μα, ατος, τό, (τέμνω)
part cut off, section, piece, Pl.Smp.191d, al.;
segment of a line, Id.R.509d, Euc.2.11, etc.; of a circle (i.e. portion cut off by a chord), Arist.Metaph.1035a34 (pl.), APr.41b18, Mete. 343a12, Euc.3 Def.6, etc.; also of the portion cut off by radii,
sector, τὰ ἀφαιρούμενα ὑπὸ τῶν ἐκ τοῦ κέντρου [τμήματα] Arist. Cael.290a3, cf. Str.2.5.34; of
lunes, ὁ τετραγωνισμὸς ὁ διὰ τῶν τμημάτων Arist.Ph. 185a16; of
segments of other figures cut off by straight lines or planes, Democr.155, Archim.Con.Sph.Prooem., al.; and of
segments bounded by a circle and a circumscribed polygon, Papp.316.2. 2.
cut, incision, wound, Pl.Grg.476c. 3.
section of a book, Ps.-Ammon. in APr.67.39. 4. Astrol.,
division between two zodiacal signs, Serapio in Cat.Cod.Astr.8(4).230.