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retromastoid
retromastoid adj.
Brit. 
/ˌrɛtrə(ʊ)ˈmastɔɪd/
, /ˌrɛtrə(ʊ)ˈmastɔɪd/U.S. /ˌrɛtroʊˈmæˌstɔɪd/
[after French rétro-mastoïdienne (1878 in the source translated in quot. 1878)] /ˌrɛtroʊˈmæˌstɔɪd/ΚΠ
1878 R. T. H. Bartley tr. P. Topinard Anthropol. 171 The retro-mastoid sutures [Fr. les sutures rétro-mastoïdiennes] are complicated.
1924 Papers Peabody Mus. Amer. Archaeol. & Ethnol. 11 i. 32 One medium retromastoid foramen is found on each side.
2001 Science 12 Jan. 295/2 (caption) Pairwise differences between Mladeč 5 and the most complete Neandertal males... Retromastoid process prominent.
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