̷ ̷ˈ ̷ ̷ ̷ ̷_nəs, -ˌnas noun
Usage: capitalized
Etymology: New Latin, from hist- + monas
: a genus of zooflagellates (family Mastigamoebidae) that exhibit both amoeboid and flagellate phases, are parasites in the liver and intestinal mucosa of chickens, turkeys, and various other birds and are usually considered to include a single species ( H. meleagridis ) that is the causative agent of blackhead