Ma'anar ƙamus na "esterify" shine canza abu zuwa ester ta hanyar haɗa shi da barasa, yawanci ta hanyar cire kwayoyin ruwa. Wannan tsarin sinadari ana kiransa esterification, kuma sau da yawa yana haɗawa da amsawa tsakanin acid carboxylic da barasa don samar da ester da ruwa. Esterification wani muhimmin maganin sinadari ne a masana'antu daban-daban, gami da samar da kamshi, dandano, da robobi.