dead reckoning
n.
"ascertaining the position of a ship by measurement of the distance run," 1610s, might be from nautical abbreviation ded. ("deduced") in log books, but it also fits dead, adj. in the sense of "unrelieved, absolute."
| 词汇 | dead reckoning |
| 词根词缀 | Online Etymology Dictionary dead reckoning n. "ascertaining the position of a ship by measurement of the distance run," 1610s, might be from nautical abbreviation ded. ("deduced") in log books, but it also fits dead, adj. in the sense of "unrelieved, absolute." |
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