membranulen.
/ˈmɛmbrənjuːl/, U.S. /ˈmɛmbrəˌn(j)ul/ Entomology.
A small membrane; spec. a small triangular opaque region at the base of the hindwing in some dragonflies.
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1857 R. G. Mayne Expos. Lexicon Med. Sci. (1860) Membranula, Membranulum,..a little membrane,..a membranule.
1861 H. Hagen Synopsis Neuroptera N. Amer. 133 Macromia taeniolata..membranule cinereous.
1949 C. Longfield Dragonflies Brit. Isles (ed. 2) 49 (table) Hind-wing very broad near base. Membranule large.
1989 S. W. Nichols Torre-Bueno Gloss. Entomol. 436 Membranule, in adult Anisoptera (Odonata), small opaque expansion behind first anal vein at extreme base of hind wing.
This is a new entry (OED Third Edition, June 2001; most recently modified version published online March 2022).
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n.1857