The analysis and recording of the strata penetrated by the drill of an oil well as an aid to exploration.

The log which, if removed, would free up the whole logjam.

present participle of log off

simple past tense and past participle of log off

(idiomatic, slang, vulgar, of a male) To masturbate.

A small simple dwelling made from logs.

(nautical) A chip log

(nautical) A taffrail log

(nautical) A simple device for measuring the speed of a vessel, consisting of a wooden board (drag) attached to a line on a reel.

(nautical) A mechanical device dragged from the stern of the vessel that indicates the vessel's speed through the water; usually consists of a propeller, a reading unit and a stiff line connecting them.