pachyderm

Từ điển WordNet v3.1 - WordNet Dictionary

noun

any of various nonruminant hoofed mammals having very thick skin: elephant;
rhinoceros;
hippopotamus
• Derivationally related forms:
pachydermic, pachydermous, pachydermatous, pachydermal
• Hypernyms:
placental, placental mammal, eutherian, eutherian mammal
• Hyponyms:
elephant
• Part Meronyms:
thick skin