Lewis Short
festūca (noun F) :
* A stalk, stem, straw.
* Lit.
* In gen.: qui homo in pratis per fenisecta festucas corradit,Varr. L. L. 5, § 136; Col. 8, 15, 6; Plin. 10, 41, 57, § 116; 18, 27, 67, § 254.
* Transf., a straw-like weed which grows among barley, also called aegilops, Plin. 18, 17, 44, § 155.
* A trifle, particle, mote: in oculo fratris,Vulg. Matt. 7, 3; id. Luc. 6, 41.
Charlton T. Lewis, Charles Short, A Latin Dictionary