GNU Collaborative International Dictionary of English
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Found one definition
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Sizer (?), n.
1. See Sizar.
[1913 Webster]
2. (Mech.) (a) An instrument or contrivance to size articles, or to determine their size by a standard, or to separate and distribute them according to size. (b) An instrument or tool for bringing anything to an exact size.
[1913 Webster]