| patent log n. Nautical A torpedo-shaped instrument with rotary fins that is dragged from the stern of a vessel to measure the speed or distance traveled. Also called screw log, taffrail log. |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. |  patent log - a cigar-shaped log with rotary fins that measure the ship's speedlog - measuring instrument that consists of a float that trails from a ship by a knotted line in order to measure the ship's speed through the water |
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