自じ由ゆう水すいじゆうすいMeanings1nounfree waterchemistryChemistry term for water that is not bound to other molecules or surfaces, as opposed to 結合水 (bound water).See also: 結合水自じ由ゆう水すいは結けつ合ごう水すいに比くらべて蒸じょう発はつしやすい。Free water evaporates more easily than bound water.