[ 'ɛstə ]
■ noun Chemistry an organic compound made by replacing the hydrogen of an acid by an alkyl or other organic group.
Derivatives
~ify ɛ'stɛrɪfʌɪ verb ( ~ifies , ~ifying , ~ified ).
Origin
C19: from Ger., prob. from a blend of Essig 'vinegar' and Äther 'ether'.