| log | | |
| n. (substance) | 1. log | a segment of the trunk of a tree when stripped of branches. |
| ~ nurse log | a large decomposing tree trunk that has fallen, usually in a forest; the decaying wood provides moisture and nutrients for a variety of insects and plants. |
| ~ saw log | log large enough to be sawed into boards. |
| ~ wood | the hard fibrous lignified substance under the bark of trees. |
| n. (communication) | 2. log, logarithm | the exponent required to produce a given number. |
| ~ exponent, index, power | a mathematical notation indicating the number of times a quantity is multiplied by itself. |
| ~ common logarithm | a logarithm to the base 10. |
| ~ napierian logarithm, natural logarithm | a logarithm to the base e. |
| n. (communication) | 3. log | a written record of messages sent or received.; "they kept a log of all transmission by the radio station"; "an email log" |
| ~ written account, written record | a written document preserving knowledge of facts or events. |
| n. (communication) | 4. log | a written record of events on a voyage (of a ship or plane). |
| ~ aeroplane, airplane, plane | an aircraft that has a fixed wing and is powered by propellers or jets.; "the flight was delayed due to trouble with the airplane" |
| ~ ship | a vessel that carries passengers or freight. |
| ~ written account, written record | a written document preserving knowledge of facts or events. |
| n. (artifact) | 5. log | 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. |
| ~ harpoon log | a cylindrical log with a device that registers distance. |
| ~ log line | a knotted cord that runs out from a reel to a piece of wood that is attached to it. |
| ~ measuring device, measuring instrument, measuring system | instrument that shows the extent or amount or quantity or degree of something. |
| ~ patent log, screw log, taffrail log | a cigar-shaped log with rotary fins that measure the ship's speed. |
| ~ ship | a vessel that carries passengers or freight. |
| v. (communication) | 6. log | enter into a log, as on ships and planes. |
| ~ record, enter, put down | make a record of; set down in permanent form. |
| v. (contact) | 7. log, lumber | cut lumber, as in woods and forests. |
| ~ fell, strike down, cut down, drop | cause to fall by or as if by delivering a blow.; "strike down a tree"; "Lightning struck down the hikers" |
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