Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
hăbēnŭla, ae, f. dim. [habena, II. A.], a small strip of diseased flesh which is cut out from the body: tum ab ora vel vulsella vel hamo apprehensam tamquam habenulam excidere, Cels. 7, 28; id. 7, 7, 8 fin.; 20 fin.