An Etymological Dictionary of Astronomy and Astrophysics

A cardinal number, ten times six. → sexagesimal.

Etymology (EN): M.E.; O.E. sixtig, from → six + -tig a suffix of numerals denoting multiples of ten.

Etymology (PE): Šast “sixty;” Mid.Pers. šast “sixty;” Av. xšuuašti- “sixty;” cf. Skt. sasti- “six;” L. sexaginta “sixty.”