It has become synonymous with slide though when the manufactureres started calling their positive films [something]chrome, their negative films [something]color.

So it is after Kodachrome, Fujichrome, Agfachrome, etc. (vs Kodacolor, Fujicolor, Agfacolor, etc.)

Quote Originally Posted by Ian Grant View Post
We had this before, the name was used to denote the fact that a film gave a full Chromatic response to the visible colour spectrum. As Thomas say's above from the Greek
I don't think that's correct.
It was because the thingy produced colour pictures, rather than monochrome.

Monochrome film that gave/gives a full chromatic response also exist, and the fact that they produce a full chromatic response is denoted by the prefix "pan".