LATIN DICTIONARYLexicon Latīnum
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“flap” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

flap s.
lacinia (PROP., of the flap or any extremity of a garment; but IMPROP., anything that hangs down loose. Thus Plin., 8, 50, 76, calls the fleshy part of the neck of a goat, laciniae a cervice dependentes; in a similar manner Linn. names the parts of a flower that hang down loose “laciniae;” so the lobes [λοβοι] of the liver were laciniae; but the flaps of the ear, auriculae).
A slight blow struck with anything, ictus or ictus levis (also of a flap of the wings, alae, pennarum, both Plin.).
The flaps (disease in a horse’s mouth), stomacace (στομακάκη], Plin., 25, 3, 6).
flap v.
TRANS., plaudere: To flap the wings, alis or pennis plaudere; alas quatere cum clangore (†): to flap off flies, muscas abigere.
INTRANS., dependere (to hang down): flaccescere (to flap down; of sails no longer extended by the wind). “A flapping hat,” *pileus labrosus (after ferramentum fecit in extrema parte labrosum, Cels.).

Quick answer

What is the Latin word for flap?
The usual Latin words for “flap” are lacinia, ictus, stŏmăcăcē; also auricula, āla, penna. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.