Denoting a nontaxonomic division of Nematoda embracing those in which the male copulatory bursa is only a skin fold containing no fleshy ribs, as seen in hookworms and other bursate nematodes.
[L. non, not, + Mediev. L. bursa, purse]
Search Stedman's Medical Dictionary
Examples: glitazone, GI cocktail, etc.