mentoposterioradj.
/ˌmɛntəʊpɒˈstɪərɪə/, U.S. /ˌmɛn(t)oʊˌpɑˈstɪriər/ Medicine.
Designating or relating to a position of the fetal head in a face presentation in which the chin is directed towards the sacrum or a sacroiliac joint of the mother.
ΚΠ
1900 W. A. N. Dorland Amer. Illustr. Med. Dict. 382/2 Mentoposterior, having the chin directed toward the back, or turned sacrad (used of the fetus at delivery).
1963 G. B. Carter et al. Dict. Midwifery (ed. 2) 171/2 If the position is mento-posterior..the doctor may try to convert the presentation into a vertex.
1994 Obstetr. & Gynecol. 84 146/1 Face presentation with persistent mentoposterior attitude is widely accepted as an absolute indication for cesarean section.
This is a new entry (OED Third Edition, September 2001; most recently modified version published online March 2022).
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adj.1900