An Etymological Dictionary of Astronomy and Astrophysics

The eye unassisted by an optical instrument, except for eyeglasses. Same as → naked eye.

Etymology (EN): → un- + aided, from aid, M.E. ayde, from
O.Fr. aidier, from L. adjutare, frequentative of adjuvare “to give help to,” from → ad- “to” + juvare “to help;” → eye.

Etymology (PE): Cašm, → eye; biyâvar “without help,” from bi- “without” + yâvar, variant yâr “helper; companion” (Mid.Pers. hayyâr “helper,” hayyârêh “help, aid, assistance,” Proto-Iranian *adyāva-bara-, cf. Av. aidū- “helpful, useful”); berehné, → naked.