ὑποτομ-ή · hypotom-ē — LSJ
a cutting off below, Plu. Sollert. 2.980c; cutting away underneath, Thphr. HP 9.2.7, Heliod ap. Orib. 45.6.3, Leonid. ap. Aët. 7.71: pl., trimmed surfaces of blocks of stone in architecture, IG 7.3073.113, 114 (Lebad., ii B. C.).
a smaller incision or line, Procl. Hyp. 3.11; ὑποτομῆς μόριον sub-division, Theol.Ar. 4.