a. [ NL. Strongylus the genus (from Gr. &unr_; round) + -oid. ] (Zool.) Like, or pertaining to, Strongylus, a genus of parasitic nematode worms of which many species infest domestic animals. Some of the species, especially those living in the kidneys, lungs, and bronchial tubes, are often very injurious. -- n. A strongyloid worm. [ 1913 Webster ]