Source : Webster's Revised Unabridged Dictionary (1913)

Mucivore \Mu"ci*vore\ (m[=u]"s[i^]*v[=o]r), n. [L. mucus slime,
   mucus + vorare to devour.] (Zo["o]l.)
   An insect which feeds on mucus, or the sap of plants, as
   certain Diptera, of the tribe {Mucivora}.