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ecto-ethmoid
ecto-ethmoid n.
Brit. 
/ˌɛktəʊˈɛθmɔɪd/
, /ˌɛktəʊˈɛθmɔɪd/U.S. /ˌɛktoʊˈɛθˌmɔɪd/
Zoology the prefrontal bone of the skull./ˌɛktoʊˈɛθˌmɔɪd/ΚΠ
1888 G. Rolleston & W. H. Jackson Forms Animal Life (ed. 2) 91 Anteriorly to the septum is a large bone, the ecto-ethmoid..(= the pre-frontal of Huxley).
1928 C. F. Cooper Parker & Haswell's Text-bk. Zool. (ed. 4) II. 78 The outer walls of the olfactory capsules may be ossified by paired ecto-ethmoids.
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as lemmas