An Etymological Dictionary of Astronomy and Astrophysics

Being out of sight; concealed.

Etymology (EN): From M.E., from O.E. hydan, from W.Gmc. *khuthjanan, from PIE keudh- (cf. Gk. keuthein “to hide, conceal”), from base (s)keu- “to cover, conceal.”

Etymology (PE): Penhân “hidden,” from Mid.Pers. pad nihân, from pad “to, at, for, in”
(from O.Pers. paity; Av. paiti “to, toward, in, at;” cf.
Skt. práti; Gk. poti) + nihân “concealment, secrecy, hiding place” (Mod.Pers. nahân), from Proto-Iranian *ni-dāna-, from ni- “down; into,” → ni- (PIE),

• dā- “to put; to establish; to give” (dadâiti “he gives;” cf. Skt. dadâti “he gives;” Gk. didomi “I give;” L. do “I give;” PIE base *do- “to give”).