This is the 14167th most frequent Russian word.
оптико
"Оптико" relates to optics or optical systems.
Here, 'оптико' serves as a prefix referring to optics, forming a compound word describing a device related to both optics and mechanics.
Оптико-механический прибор используется в астрономии.
An opto-mechanical device is used in astronomy.
In this sentence, 'оптико' again serves as a prefix, combining with 'электронные' to describe systems involving both optics and electronics.
Современные технологии включают в себя оптико-электронные системы.
Modern technologies include opto-electronic systems.
Here, 'оптико' is part of a term representing a subfield of physics, emphasizing its connection to optics.