Etymology
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Words related to lodestone

lode (n.)
Middle English spelling of load (n.) "a burden," it keeps most of the word's original meaning "a way, a course, something to be followed." The differentiation in sense took place 16c., that of spelling somewhat later. Mining sense of "vein of metal ore" is from c. 1600, from the notion of miners "following" it through the rock. Also found in lodestone, lodestar, and, somewhat disguised, livelihood. Middle English also had lodesman (c. 1300) "leader, guide; pilot, steersman."
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stone (n.)
Old English stan, used of common rocks, precious gems, concretions in the body, memorial stones, from Proto-Germanic *stainaz (source also of Old Norse steinn, Danish steen, Old Saxon sten, Old Frisian sten, Dutch steen, Old High German stein, German Stein, Gothic stains), from PIE *stoi-no-, suffixed form of root *stai- "stone," also "to thicken, stiffen" (source also of Sanskrit styayate "curdles, becomes hard;" Avestan stay- "heap;" Greek stear "fat, tallow," stia, stion "pebble;" Old Church Slavonic stena, Russian stiena "wall").

Sense of "testicle" is from late Old English. The British measure of weight (usually equal to 14 pounds) is from late 14c., originally a specific stone. Stone-fruit, one with a pit, is from 1520s. Stone's throw for "a short distance" is attested from 1580s. Stone Age is from 1864. To kill two birds with one stone is first attested 1650s. To leave no stone unturned is from 1540s.
lodestar (n.)

late 14c. (late 13c. as a surname), "a star that leads or serves to guide," an old name for the pole star as the star that "leads the way" in navigation; from lode (n.) "a way, a course, something to be followed" (a Middle English variant spelling of load (n.) that preserved the original Old English sense of that noun) + star (n.). Figurative use from late 14c. Compare lodestone. Similar formation in Old Norse leiðarstjarna, German Leitstern, Danish ledestjerne.

loadstone (n.)
see lodestone, and compare load (n.).