GNU Collaborative International Dictionary of English
Found one definition
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Misy (?), n. [Cf. L. misy a mineral, perh. copperas, Gr. >.] (Min.) An impure yellow sulphate of iron; yellow copperas or copiapite.
[1913 Webster]
Misy (?), n. [Cf. L. misy a mineral, perh. copperas, Gr. >.] (Min.) An impure yellow sulphate of iron; yellow copperas or copiapite.
[1913 Webster]