| 词汇 | saltpeter |
| 词根词缀 | 词源： "potassium nitrate," c.1500, earlier salpetre (early 14c.), from O.Fr. salpetre, from M.L. sal petrae "salt of rock," from L. sal "salt" (see salt) + petra "rock, stone." So called because it looks like salt encrusted on rock. |
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