We found 54 dictionaries that define the word FIR:

General (34 matching dictionaries)

1. fir: Merriam-Webster.com
2. fir: Oxford Learner's Dictionaries
3. fir: American Heritage Dictionary of the English Language
4. fir: Collins English Dictionary
5. Fir, fir: Wordnik
6. fir: Cambridge Advanced Learner's Dictionary
7. FIR, fir: Wiktionary
8. fir: Webster's New World College Dictionary, 4th Ed.
9. fir: The Wordsmyth English Dictionary-Thesaurus
10. fir: Infoplease Dictionary
11. FIR: Dictionary.com
12. fir: Online Etymology Dictionary
13. fir: Cambridge Essential American English Dictionary
14. F.I.R, F.I.R. (TV series), F.I.R. (album), F.I.R. (film), F.I.R (SAB TV), FIR (disambiguation), FIR, Fir: Wikipedia, the Free Encyclopedia
15. Fir: Online Plain Text English Dictionary
16. fir: Webster's Revised Unabridged, 1913 Edition
17. fir: Rhymezone
18. fir: AllWords.com Multi-Lingual Dictionary
19. fir: Webster's 1828 Dictionary
20. FIR: Stammtisch Beau Fleuve Acronyms
21. fir: Free Dictionary
22. fir: Mnemonic Dictionary
23. fir: LookWAYup Translating Dictionary/Thesaurus
24. fir: Dictionary/thesaurus
25. fir: Wikimedia Commons US English Pronunciations

Business (1 matching dictionary)

26. Comprehensive Financial (No longer online)

Computing (3 matching dictionaries)

27. FIR: Free On-line Dictionary of Computing
28. BABEL: Computer Oriented Abbreviations and Acronyms (No longer online)
29. fir: Encyclopedia

Medicine (2 matching dictionaries)

30. online medical dictionary (No longer online)
31. Allergy Glossary (No longer online)

Miscellaneous (5 matching dictionaries)

32. Navajo Code Talkers' Dictionary (No longer online)
33. Sound-Alike Words (No longer online)
34. FIR: Acronym Finder
35. FIR: Three Letter Words with definitions
36. AbbreviationZ (No longer online)

Religion (2 matching dictionaries)

37. Fir: Easton Bible
38. Fir: Smith's Bible Dictionary

Science (1 matching dictionary)

39. FIR: Extragalactic Astronomy

Slang (3 matching dictionaries)

40. fir: Green’s Dictionary of Slang
41. Fir: Street Terms: Drugs and the Drug Trade
42. FIR, fir: Urban Dictionary

Tech (3 matching dictionaries)

43. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)
44. Sandahl, Middle English Sea Terms (No longer online)
45. RF Terms Glossary (No longer online)

(Note: See firing as well.)

Definitions from Wiktionary (FIR) ▸ noun:  (chiefly countable) A conifer of the genus Abies. ▸ noun:  (chiefly countable) Any pinaceous conifer of related genera, especially a Douglas fir (Pseudotsuga) or a Scots pine (Pinus sylvestris). ▸ noun:  (uncountable) Wood of such trees. ▸ adjective:  (signal processing, of a filter) Initialism of finite impulse response; that has impulse response (or response to any finite length input) of finite duration. ▸ noun:  (aviation) Initialism of flight information region; a specified region of airspace in which a flight information service (FIS) and an alerting service (ALRS) are provided [(aviation) A specified region of airspace in which a flight information service and an alerting service are provided.] ▸ noun:  (South Asia, Singapore, law enforcement) Initialism of first information report. ▸ noun:  (uncountable) Abbreviation of far infrared or far infrared radiation. Similar: fir tree, true fir, silver fir, abies, noble fir, red fir, firtree, white fir, pine, Colorado fir, more... Opposite: soft, pliable, flexible, yielding, malleable Types: Douglas fir, red fir, white fir, balsam fir, grand fir, silver fir, noble fir, ponderosa pine, more... Phrases: Douglas fir, fir trees, balsam fir, fir tree, fir filter, more... Adjectives: white, scotch, red, subalpine, alpine, silver, noble, grand, balsam, young, tall ▸ Word origin ▸ Words similar to FIR ▸ Usage examples for FIR ▸ Idioms related to FIR ▸ Civic discussion about FIR (New!) ▸ Popular adjectives describing FIR ▸ Popular nouns described by FIR ▸ Words that often appear near FIR ▸ Rhymes of FIR ▸ Invented words related to FIR