ab·sorp·ti·om·e·ter \əbˌsȯrpshēˈäməd.ər, (ˌ)ab-, -ˌzȯ-, -ptē-\noun Etymology:absorption + -meter 1.: an instrument for measuring the reduction of pressure in a gas as it is absorbed by a liquid to determine the absorption rate 2.: a colorimeter for transparent fluids usually employing photoelectric means of comparison • ab·sorp·ti·o·met·ric\ ̷ ̷| ̷ ̷ ̷ ̷ō|me.trik\adjective