| 单词 | pearl grain |
| 释义 | > as lemmaspearl grain pearl grain n. a unit of weight used for measuring pearls, equal to one quarter of a carat. ΘΚΠ the world > relative properties > measurement > measurement by weighing > [noun] > unit or denomination of weight > unit of weight for precious stones > fractions of carat abas1677 pearl grain1858 point1931 1858 P. L. Simmonds Dict. Trade Products 279/2 The troy ounce contains 600 pearl grains, and hence one pearl grain is 4-5ths of a troy grain. 1913 Science 10 Oct. 524/2 A carat equal 200 milligrams; five carats, one gram, and 5,000 carats (or 20,000 pearl grains), one kilogram. 1948 R. M. Pearl Pop. Gemol. vi. 236 Seed pearls are round ones weighing less than a quarter of a pearl-grain, and dust pearls are the most minute in size. < as lemmas |
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