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bell
1 This popular and ubiquitous mus. instr. varies in weight from over 100 tons to a fraction of an ounce. For public bells the most usual bell metal is a bronze of 13 parts copper to 4 parts tin: the ...

menstruation
(menses) n. the discharge of blood and of fragments of endometrium from the vagina at intervals of about one month in women of child-bearing age (see menarche, menopause). Menstruation is that stage ...
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