Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
strebŭla, ae, f., and strebŭla (stri-bŭla), ōrum, n., the flesh about the haunches: strebula Umbrico nomine Plautus appellat coxendices hostiarum, etc., Fest. p. 313; cf. id. p. 312 Müll.: stribula, ut Opilius scribit, circum coxendices sunt bovis, Varr. L. L. 7, § 67 ib.: non placet carnem strebulam appellare, quae taurorum e coxendicibus demitur, Arn. 7, 230.
stribŭla, ae, v. strebula.