Meaning

noun toothless mammal of southern Africa and Asia having a body covered with horny scales and a long snout for feeding on ants and termites

noun any of several tropical American mammals of the family Myrmecophagidae which lack teeth and feed on ants and termites

noun nocturnal burrowing mammal of the grasslands of Africa that feeds on termites; sole extant representative of the order Tubulidentata

originFrom ant + eater, from their typical diet.

Etymology from Wiktionary, CC BY-SA 3.0