killakutz.com -Log 2: an apparatus for measuring the rate of a ship's motion through the water that consists of a block fastened to a line and run out from a reel
Define Log at dictionary.com. any of various records, made in rough or finished form, concerning a trip made by a ship or aircraft and dealing with particulars of navigation, weather, engine performance, discipline, and other pertinent details; logbook.
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Definition of log by the free dictionary. log 1 (lôg, lŏg) n. 1. a. A usually large section of a trunk or limb of a fallen or felled tree. b. A long thick section of trimmed, unhewn timber. 2. Nautical a. A device trailed from a ship to determine its speed through the water. b. A record of a ship's speed, its progress, and any shipboard events of navigational importance. c. The book