A combining form meaning "having and dealing with three dimensions of space; solid."
From stereo a shortening of stereotype, from Fr. stéréotype (adj.) "printing by means of a solid plate of type," from Gk. stereos "solid."
Loan from Fr., as above.
Fr.: stéréo comparateur
A device that allows two images of the sky taken at different times to be optically superimposed so that changes in star brightness or moving objects can be detected.