An Etymological Dictionary of Astronomy and Astrophysics

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thirty

سی

si (#)

Fr.: trente

A cardinal number, 10 times 3.

M.E. thritty, O.E. thritig, from thri, threo "three" + -tig "group of ten, -ty."

Si, from Mid.Pers. sih; O.Pers. *ciθas nominative singular of *ciθant-; Av. θrisant- "thirty;" cf. Skt. trimśát- "thirty."

An Etymological Dictionary of Astronomy and Astrophysics
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