any coniferous tree belonging to the genus Abies, of the pine family, characterized by its pyramidal style of growth, flat needles, and erect cones.
the wood of such a tree.

1250–1300; Middle English firre, Old English fyrh; cognate with Old Saxon furie; akin to Old English furh- (in fuhrwudu pine), Old Norse fura fir, Latin quercus oak (< *perkwu-)

fir, fur. Unabridged


far-infrared radiation. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fir (fɜː)
1.  red fir silver fir See also balsam fir any pyramidal coniferous tree of the N temperate genus Abies, having single needle-like leaves and erect cones: family Pinaceae
2.  any of various other trees of the family Pinaceae, such as the Douglas fir
3.  the wood of any of these trees
[Old English furh; related to Old Norse fura, Old High German foraha fir, Latin quercus oak]

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

c.1300; O.E. had furhwudu "pine wood," but the modern word is more likely from O.N. fyri- "fir" or O.Dan. fyr, all from P.Gmc. *furkhon (cf. O.H.G. foraha, Ger. Föhre "fir"), from PIE base *perkos, originally "oak" (cf. Skt. paraktah "the holy fig tree," Hind. pargai "the evergreen oak," L. quercus
"oak," Lombard. fereha "a kind of oak").
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

FIR definition

1. Finite Impulse Response (filter).
2. Fast Infrared. Infrared standard from IrDA, part of IrDA Data. FIR supports synchronous communications at 4 Mbps (and 1.115 Mbps?), at a distance of up to 1 metre.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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American Heritage
Abbreviations & Acronyms
far infrared
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Bible Dictionary

Fir definition

the uniform rendering in the Authorized Version (marg. R.V., "cypress") of _berosh_ (2 Sam. 6:5; 1 Kings 5:8, 10; 6:15, 34; 9:11, etc.), a lofty tree (Isa. 55:13) growing on Lebanon (37:24). Its wood was used in making musical instruments and doors of houses, and for ceilings (2 Chr. 3:5), the decks of ships (Ezek. 27:5), floorings and spear-shafts (Nah. 2:3, R.V.). The true fir (abies) is not found in Palestine, but the pine tree, of which there are four species, is common. The precise kind of tree meant by the "green fir tree" (Hos. 14:8) is uncertain. Some regard it as the sherbin tree, a cypress resembling the cedar; others, the Aleppo or maritime pine (Pinus halepensis), which resembles the Scotch fir; while others think that the "stone-pine" (Pinus pinea) is probably meant. (See PINE.)

Easton's 1897 Bible Dictionary
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Example sentences
Her mast is of a single fir tree, rather than of extruded aerospace alloy.
Eucalyptus branches and pods impart a blue glow to a simple fir wreath.
Miniature carnations and spiky fir needles create a wreath that's both fragrant
  and strikingly elegant.
Most of the interior walls are not full height, so the flowing fir ceiling
  appears to float above the rooms.
Images for FIR
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