1 [pawr, pohr]
verb (used without object), pored, poring.
to read or study with steady attention or application: a scholar poring over a rare old manuscript.
to gaze earnestly or steadily: to pore over a painting.
to meditate or ponder intently (usually followed by over, on, or upon ): He pored over the strange events of the preceding evening.

1250–1300; Middle English pouren < ?

pause, paws, pores, pours.

3. ponder, scrutinize, peruse, examine.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pore1 (pɔː)
vb (foll by over, on, or upon) (foll by over, on, or upon)
1.  (foll by over) to make a close intent examination or study (of a book, map, etc): he pored over the documents for several hours
2.  to think deeply (about): he pored on the question of their future
3.  rare to look earnestly or intently (at); gaze fixedly (upon)

pore2 (pɔː)
1.  anatomy, zoology any small opening in the skin or outer surface of an animal
2.  botany any small aperture, esp that of a stoma through which water vapour and gases pass
3.  any other small hole, such as a space in a rock, soil, etc
[C14: from Late Latin porus, from Greek poros passage, pore]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

c.1300, perhaps from O.E. *purian, suggested by spyrian "to investigate, examine," and spor "a trace, vestige."

late 14c., from L. porus "a pore," from Gk. poros "a pore," lit. "passage, way," from PIE *por- "going, passage," from base *per- "to lead, pass over" (see port (1)).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

pore (pôr)

  1. A minute opening in an animal or plant tissue.

  2. One of the minute openings of the sweat glands of the skin.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
pore   (pôr)  Pronunciation Key 
  1. A tiny opening, as one in an animal's skin or on the surface of a plant leaf or stem, through which liquids or gases may pass.

  2. A space in soil, rock, or loose sediment that is not occupied by mineral matter and allows the passage or absorption of fluids, such as water, petroleum, or air.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The engineers pored over logs, desperately looking for a cause.
He pored over it in the coming months, ultimately deciding that he held in his
  hands the key to the world's energy future.
His goals shifted from architecture to petroleum, and he pored over geology and
  engineering books to educate himself.
He pored over medical journals, befriended and debriefed experts, gave speeches.
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