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postsylvian
postsylvian adj.
Brit. 
/(ˌ)pəʊs(t)ˈsɪlvɪən/
, /(ˌ)pəʊs(t)ˈsɪlvɪən/U.S. /ˌpoʊs(t)ˈsɪlviən/
Anatomy and Medicine (now rare) situated behind the Sylvian fissure of the brain./ˌpoʊs(t)ˈsɪlviən/ΚΠ
1868 R. Owen On Anat. Vertebr. III. 125 A ‘postsylvian fissure’..is added.
1977 Paleobiology 3 346/1 The appearance of a dimple ventral to the caudal end of the suprasylvian sulcus in Procynodictis suggests incipient development of a postsylvian sulcus (= posterior limb of the suprasulvian sulcus).
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