Entry 1 sense Webster, 1913 Mucivore /(mū"sĭ*vōr)/ · Mu·ci·vore · IPA 01 n. An insect which feeds on mucus, or the sap of plants, as certain Diptera, of the tribe Mucivora. 1. An insect which feeds on mucus, or the sap of plants, as certain Diptera, of the tribe Mucivora.(Zool.)