Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
furcilla, ae, f. dim. [furca], a little fork: herba subsecari falcibus debet et, quoad perarescat, furcillis versari, Varr. R. R. 1, 49, 1; 1, 8, 6; Col. 2, 10, 13: quoniam furcillā extrudimur, Brundisium cogito, Cic. Att. 16, 2, 4; cf.: musae furcillis praecipitem eiciunt, Cat. 105, 2.
Also, ‡furcilles, sive ‡furcilla, quibus homines suspendebant, Paul. ex Fest. p. 88 Müll.
* furcillo, āre, v. a. [furcilla], to support (qs. by a crotch).
Trop.: tu inventus vero, meam qui furcilles fidem! Plaut. Ps. 2, 2, 36.