a hard, impure, protein gelatin, obtained by boiling skins, hoofs, and other animal substances in water, that when melted or diluted is a strong adhesive.
any of various solutions or preparations of this substance, used as an adhesive.
any of various other solutions or preparations that can be used as adhesives.
verb (used with object), glued, gluing.
to join or fasten with glue.
to cover or smear (something) with glue (sometimes followed by up ).
to fix or attach firmly with or as if with glue; make adhere closely: to glue a model ship together.

1300–50; (noun) Middle English glu, gleu < Old French glu < Latin glūt- (stem of glūs); cognate with Greek gloiós gum, anything sticky; (v.) Middle English glywen, glewen, derivative of the noun

gluelike, adjective
gluer, noun
reglue, verb (used with object), reglued, regluing.

4. paste, gum, stick, cement, plaster. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
glue (ɡluː)
1.  any natural or synthetic adhesive, esp a sticky gelatinous substance prepared by boiling animal products such as bones, skin, and horns
2.  any other sticky or adhesive substance
vb , glues, gluing, glueing, glued
3.  (tr) to join or stick together with or as if with glue
[C14: from Old French glu, from Late Latin glūs; compare Greek gloios]

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

early 14c., from O.Fr. glu, from L.L. glus (gen. glutis) "glue," from L. gluten "glue," from PIE *gleit- "to glue, paste" (cf. Lith. glitus "sticky," glitas "mucus;" O.E. cliða "plaster").
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

glue definition

A generic term for any interface logic or protocol that connects two component blocks. For example, Blue Glue is IBM's SNA protocol, and hardware designers call anything used to connect large VLSI's or circuit blocks "glue logic".
[Jargon File]

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Some of the glue affected the paint, causing small blisters in places.
Wire, glue and tape fastened the fragile creations together, and backdrops of
  the heavens teetered against wine bottles.
Clumping is a community event and the conversations during the clumping are the
  glue that keeps us together.
The birds glue their nests hundreds of feet high on sheer cave walls.
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