An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

A cardinal number, 10 times 2.

M.E.; O.E. twentig "group of twenty," from twegen→ two; cf. O.Fris. twintich, Du. twintig, O.H.G. zweinzug, Ger. zwanzig.

Bist "twenty;" Mid.Pers. wist "twenty;" Av. vīsaiti "twenty;" cf. Skt. vimśati- "twenty;" Gk. eikosi "twenty;" L. uiginti "twenty."