An Etymological Dictionary of Astronomy and Astrophysics

Elongated in the direction of the polar diameter; opposed to → oblate

Etymology (EN): From L. prolatus, pt.p. of proferre “to bring forward, extend,”
from → pro- + → oblate.

Etymology (PE): Kešidé p.p. of
Mod./Mid.Pers. kešidan, kašidan “to draw, protract,
trail, drag, carry,” dialectal Yaqnavi xaš “to draw,” Qomi xaš “streak, stria, mark,” Lori kerr “line;”
Av. karš- “to draw; to plow,” karša- “furrow;” Proto-Iranian *kerš-/*xrah- “to draw, plow;” cf. Skt. kars-, kársati “to pull, drag, plow;”
Gk. pelo, pelomai “to move, to bustle;” PIE base k^wels- “to plow.”