early 15c., from Middle French optique, obtique (c. 1300) and directly from Medieval Latin opticus "of sight or seeing," from Greek optikos "of or having to do with sight," from optos "seen, visible," from op-, root of opsesthai "be going to see," related to ops "eye," from PIE *okw- "to see" (see eye (n.)).
例文
1. The reason for this that the optic nerve is a part of the brain.
この原因は視神経が脳の一部であることにある。
2.But with fiber- optic cables，television will become truly interactive.
しかし、光ファイバケーブルがあれば、テレビは本当にインタラクティブになることができます。
3.Retinal hemorrrhage，and blurring of the optic dise cause visual disturbances.
網膜出血や神経盤ファジィなどは視力障害を引き起こす可能性がある。
4.We first take up the subject of optic ray propagation through a variety of optical media.
まず各種光学媒体を介した光ビームの伝播問題を研究する。
5.Crystals of this type，having only one optic axis，are called uniaxial crystals.