heptad

Từ điển WordNet v3.1 - WordNet Dictionary

noun

the cardinal number that is the sum of six and one
• Syn:
seven, 7, VII, sevener, septet, septenary
• Derivationally related forms:
seven (for: seven)
• Hypernyms:
digit, figure

• Từ đồng nghĩa / Synonyms:
  seven, 7, VII, sevener, septet, septenary