pi

Từ điển WordNet v3.1 - WordNet Dictionary

noun

1. the ratio of the circumference to the diameter of a circle;
approximately equal to 3.14159265358979323846...
• Hypernyms:
transcendental number
2. the 16th letter of the Greek alphabet
• Hypernyms:
letter, letter of the alphabet, alphabetic character
• Member Holonyms:
Greek alphabet

• Từ đồng nghĩa / Synonyms:
  protease inhibitor, PI, principal investigator, private detective, private eye, private investigator, operative, shamus, sherlock