undecyl

noun
un·decyl | \ ¦ən¦desə̇l , -dēs- \

Definition of undecyl 

: an alkyl radical C11H23 derived from an undecane especially : the normal radical CH3(CH2)9CH2

called also hendecyl

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History and Etymology for undecyl

International Scientific Vocabulary undec- + -yl

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occurring twice a year or every two years

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