fira coniferous tree belonging to the pine family, characterized by its pyramidal style of growth, flat needles, and erect conesNot to be confused with:fur ? the fine, soft, thick, hairy coat of the skin of a mammalAbused, Confused, & Misused Words by Mary Embree Copyright © 2007, 2013 by Mary EmbreeFIRabbr. far-infrared radiationfir (fûr)n.1. a. Any of various evergreen trees of the genus Abies, having linear flattened needles and erect cones with deciduous scales.b. Any of several similar or related trees, such as the Douglas fir.2. The wood of any these trees.[Middle English firre, probably of Scandinavian origin; see perkwu- in Indo-European roots.]fir?ry adj.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.fir (f??) n1. (Plants) any pyramidal coniferous tree of the N temperate genus Abies, having single needle-like leaves and erect cones: family Pinaceae. See also red fir, silver fir, balsam fir2. (Plants) any of various other trees of the family Pinaceae, such as the Douglas fir3. (Plants) 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 and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014fir (f?r) n. 1. any evergreen tree of the genus Abies, of the pine family, having flat needles and erect cones. 2. the wood of such a tree. [1250?1300; Middle English firre, Old English fyrh] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.firDouglas firs can attain heights of more than 200 feet (61 meters).fir (fûr) Any of various evergreen trees that have flat needles and bear cones. Firs generally grow in northern regions or at higher altitudes.The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.pine, fir, spruce – Pine, fir, and spruce are quite different from each other, though they are all conifers; pine has clusters of long, needle-shaped leaves, spruce is a type of fir, and the only scientific difference between the two is that spruces have rectangular needles while firs have flat, needle-shaped leaves.See also related terms for pine.Farlex Trivia Dictionary. © 2012 Farlex, Inc. All rights reserved.