Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
nītēdŭla, ae, f., a kind of small red mouse, a dormouse, Cic. Sest. 33, 72: cf.: nitedula mus agrestis rubeus, Serv. ad Verg. G. 1, 181; Arn. 2, 47 (Hor. Ep. 1, 7, 29, the common read. is volpecula, but Bentley’s conjecture, nitedula, is adopted by Lachm. ad Lucr. p. 204, and by Haupt and Müll.; v. Orell. ad loc.).
The contr. collat. form nītēla, v. under nitella.
1. nĭtēla, ae, f. [niteo], brightness, splendor (post-class.).
2. nītēla, v nitella.
nītella, ae, f. (contr from nitedula, q. v, sometimes written nītēla, but v. Lachm. ad Lucr. 3, 1015), a small mouse, a dormouse, Plin. 8, 57, 82, § 224; Mart. 5, 37, 8; Serv ad Verg. G. 1, 181.