a piece of blotting paper used to absorb excess ink, to protect a desk top, etc.
a book in which transactions or events, as sales or arrests, are recorded as they occur: a police blotter.
Machinery. a soft washer of blotting paper or felt for cushioning a brittle object against shock or pressure or for increasing the friction or contact area between two surfaces.

1585–95; 1887 for def 2; blot1 + -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
blotter (ˈblɒtə)
1.  something used to absorb excess ink or other liquid, esp a sheet of blotting paper with a firm backing
2.  (US) a daily record of events, such as arrests, in a police station (esp in the phrase police blotter)

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1590s, "thing for drying wet spots," from blot. Meaning "bad writer" is from c.1600. Sense of "day book" is from 1670s, and the word was applied early 19c. to rough drafts, scrap books, notebooks, and draft account books. Hence the police jargon sense "arrest record sheet," recorded from 1887.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Only once did one of the dedicated students show up in the police blotter.
He scowled at me over the blotter, called me a thief, and said that he had a
  good mind to lock me up.
Such an item is usually confined to that burgeoning beat, the sports-page
  police blotter.
Checking the police blotter as college football nears.
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