optical film log

optical Adjective

— If something is optical, it is related to sight, optics or visible light.

film Noun

— A film is a recording of a moving picture that tells stories including actors, directors, and producers. The studio has hired some actors to make a film about the making of Wiktionary. Let's go to the theatre and watch a film. — The art or business of making films. I studied film at college and now I'm a writer. — Film is a thin, clear material used for taking photographs or movies. My new camera is digital and doesn't need film. — A film is a flat, thin material or substance often covering something. The soap left a sticky film on the glass. We use a plastic film to protect the food.

film Verb

— If you film something, you record it as a moving picture. Somebody filmed the attack with their cell phone and showed it to police.

log Noun

— A log is a piece of wood that is long and round that has been cut off a tree. We need another log to make a nice big fire. — A log is a place where people or computer programs write things when they happen, and they write the date (and maybe the time) every time they write something. We need to keep a log of everyone going into and out of this building. — In mathematics, a log is a logarithm.

log Verb

— When people log a forest, they cut down the trees to make logs. This was a forest here, but it was logged a few years ago. — When someone logs something, they write it in a log book. Make sure you log that so we'll remember what time it happened.