Usually means: Chemical group with four carbons.
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We found 27 dictionaries that define the word butyl:

General (19 matching dictionaries)
  1. butyl: Merriam-Webster
  2. butyl: Oxford Learner's Dictionaries
  3. butyl: American Heritage Dictionary of the English Language
  4. butyl: Collins English Dictionary
  5. butyl: Vocabulary.com
  6. Butyl, butyl: Wordnik
  7. butyl: Wiktionary
  8. butyl: Webster's New World College Dictionary, 4th Ed.
  9. butyl: Infoplease Dictionary
  10. butyl: Dictionary.com
  11. Butyl: Wikipedia, the Free Encyclopedia
  12. Butyl: Online Plain Text English Dictionary
  13. butyl: Webster's Revised Unabridged, 1913 Edition
  14. butyl: Rhymezone
  15. Butyl: AllWords.com Multi-Lingual Dictionary
  16. butyl: FreeDictionary.org
  17. butyl: Mnemonic Dictionary
  18. butyl: TheFreeDictionary.com
  19. butyl: The Wordsmyth English Dictionary-Thesaurus

Computing (1 matching dictionary)
  1. butyl: Encyclopedia

Medicine (4 matching dictionaries)
  1. butyl: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. online medical dictionary (No longer online)
  4. butyl: Medical dictionary

Tech (3 matching dictionaries)
  1. AUTOMOTIVE TERMS (No longer online)
  2. National Glass Association Glossary (No longer online)
  3. Illustrated Glass Dictionary (No longer online)

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Definitions from Wiktionary (butyl)

▸ noun:  (organic chemistry) Any of four isomeric univalent hydrocarbon radicals, Câ‚„H₉, formally derived from butane by the loss of a hydrogen atom.
▸ noun:  A synthetic rubber made by the polymerization of isobutylene.

Similar:
butyl alcohol, butenyl, butynyl, butylidene, isobutyl, butenylidene, butylbenzene, butane, butadiynyl, methylbutene, more...

Opposite:
ethyl, propyl, methyl

Types:
isobutyl, sec-butyl, tert-butyl, amyl, isopropyl, more...

Phrases:
butyl alcohol, butyl rubber, Butyl acetate, butyl ether, Butyl acrylate, more...

Adjectives:
tert, sec, tertiary, fluazifop, iso, secondary, normal, methyl, ferf, terf, propyl

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Similar:
butyl alcohol, butenyl, butynyl, butylidene, isobutyl, butenylidene, butylbenzene, butane, butadiynyl, methylbutene, more...

Opposite:
ethyl, propyl, methyl

Types:
isobutyl, sec-butyl, tert-butyl, amyl, isopropyl, more...

Phrases:
butyl alcohol, butyl rubber, Butyl acetate, butyl ether, Butyl acrylate, butyl chloride, Butyl group, butyl phthalate, Butyl nitrite, butyl mercaptan, butyl alcohols, butyl rubbers, butyl nitrate, tert butyl, more...

Adjectives:
tert, sec, tertiary, fluazifop, iso, secondary, normal, methyl, ferf, terf, propyl



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