optic
adjective [ before noun ] physics, medical specialized uk/ˈɒp.tɪk/ us/ˈɑːp.tɪk/
光学的;眼睛的;视觉的
relating to light or the eyes
a fibre optic cable 纤维光缆
optic
noun [ C ] UK uk/ˈɒp.tɪk/ us/ˈɑːp.tɪk/
在酒吧里，安在酒瓶上用来测量一小杯烈酒的容器
a device attached to a bottle of spirits in a bar that measures the correct amount for one (= one small drink)