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occipitoposterior
occipitoposterior adj. 
/əkˌsɪpᵻtə(ʊ)pɒˈstɪərɪə/, /ɑkˌsɪpᵻdoʊˌpoʊˈstɪriər/ [after French occipito-postérieur (1829 in the passage translated in quot. 1831)] Obstetrics designating a type of cephalic presentation in childbirth in which the fetal occiput is directed towards the posterior half of the mother's pelvis (usually towards the sacrum or left or right sacroiliac joint).
Brit. /ɒkˌsɪpᵻtə(ʊ)pɒˈstɪərɪə/
, /ɒkˌsɪpᵻtə(ʊ)pɒˈstɪərɪə//əkˌsɪpᵻtə(ʊ)pɒˈstɪərɪə/U.S. /ɑkˌsɪpᵻdoʊˌpɑˈstɪriər/
, /ɑkˌsɪpᵻdoʊˌpɑˈstɪriər//ɑkˌsɪpᵻdoʊˌpoʊˈstɪriər/ΚΠ
1831 C. D. Meigs tr. A. A. L. M. Velpeau Elem. Treat. Midwifery v. 290 The English accoucheurs..bestow the title of natural labour only upon the occipito-anterior position, while according to them, the occipito-posterior position belongs to the class of preternatural labour.
1855 J. King Amer. Eclectic Obstetrics viii. 283 Left occipito-posterior, in which the occiput looks toward the left sacro-iliac symphysis of the mother, or posteriorly and to the left of the pelvis.
1971 Brit. Med. Bull. 27 49/1 Impaired performance was associated with toxaemia, occipitoposterior presentation and delivery in an ambulance.
1992 J. W. K. Ritchie in N. R. C. Roberton Textbk. Neonatol. (ed. 2) vi. 94/2 The procedure [sc. epidural anaesthesia] is useful in the primigravid mother whose labour requires acceleration with oxytocin, and in relief of the backache associated with occipitoposterior position.
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