twain

Từ điển WordNet v3.1 - WordNet Dictionary

noun

two items of the same kind
• Syn:
couple, pair, twosome, brace, span,
span, couplet, distich, duo, duet,
dyad, duad
• Derivationally related forms:
pair (for: pair), couple (for: couple)
• Hypernyms:
two, 2, II, deuce
• Hyponyms:
doubleton
• Part Meronyms:
mate, fellow