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postanal
postanal adj.
Brit. 
/(ˌ)pəʊstˈeɪnl/
, /(ˌ)pəʊstˈeɪnl/U.S. /ˌpoʊstˈeɪn(ə)l/
Anatomy and Zoology situated behind or posterior to the anus./ˌpoʊstˈeɪn(ə)l/ΘΚΠ
the world > life > the body > digestive or excretive organs > digestive organs > intestines > [adjective] > rectum > anus > situated near
anal1769
postanal1852
perianal1876
periproctic1890
1852 S. F. Baird & C. Girard in H. Stansbury Explor. & Surv. Valley Great Salt Lake (U.S. Army Corps Topogr. Engineers) App. C. 356 In the post-anal groove some larger scales may occasionally be seen.
1888 G. Rolleston & W. H. Jackson Forms Animal Life (ed. 2) 335 There is generally said to be a post-anal section of the archenteron in Vertebrata which communicates by a neur-enteric canal with the neural tube.
1995 J. S. Ryland in P. J. Hayward & J. S. Ryland Handbk. Marine Fauna N.W. Europe xiv. 735/1 Greater pipefish... Eggs carried in a postanal brood pouch.
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