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lodestone
[lodestone 词源字典]
lodestone:
see
load
[lodestone etymology, lodestone origin, 英语词源]
lodestone (n.)
"magnetically polarized oxide of iron," 1510s, literally "way-stone," from
lode
+
stone
(n.). So called because it was used to make compass magnets to guide mariners. Figurative use from 1570s.