mentoverticaladj.
/ˌmɛntə(ʊ)ˈvəːtᵻkl/, U.S. /ˌmɛn(t)oʊˈvərdək(ə)l/ Obstetrics.
Designating the diameter of the fetal head from the chin to the highest point of the vertex.
ΚΠ
1906 T. W. Eden Man. Midwifery iv. 236 Brow presentations... The brow presents at the brim, and the longest diameter of the head (mento-vertical, 5½ inches) becomes the diameter of engagement.
1985 M. F. Myles Textbk. Midwives (ed. 10) iv. 61 The engaging diameter is the mento-vertical, 13.5 cm, with a circumference of 38 cm.
1991 Jrnl. Perinatol. 11 105 In the normal term labor with vertex presentation, the suboccipito-bregmatic diameter shortens and the mentovertical diameter lengthens.
This is a new entry (OED Third Edition, September 2001; most recently modified version published online March 2022).
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