ˈbyüd. ə l, -üt ə l, -üˌtil noun
( -s )
Etymology: International Scientific Vocabulary but- + -yl
: any of four isomeric alkyl radicals C 4 H 9 derived from butane and isobutane:
a. : the normal radical CH 3 CH 2 CH 2 CH 2 − — called also n-butyl
b. : the secondary radical CH 3 CH 2 CH(CH 3 )− — called also sec-butyl
c. : the tertiary radical (CH 3 ) 3 C− — called also tert-butyl
d. : isobutyl