An Etymological Dictionary of Astronomy and Astrophysics

A pathological condition of vision in which a single object appears double because the eyes are not focusing properly. Same as → double vision.

Etymology (EN): From L. diplo- “double, in pairs,” from Gk., combining form of diplos “twofold”

• -opia, from Gk. -opia, from ops “eye.”

Etymology (PE): Dobini, from do→ two + bini “vision, seeing,” from bin “to see; seer” (present stem of didan;
Mid.Pers. wyn-; O.Pers. vain- “to see;” Av. vaēn- “to see;”
Skt. veda “I know;” Gk. oida “I know,” idein “to see;” L. videre “to see;” PIE base *weid- “to know, to see”).