Labile (?), a. [L. labilis apt to slip, fr. labi to slip.] 1. Liable to slip, err, fall, or apostatize. [Obs.] Cheyne.[1913 Webster]
2. Liable or likely to change.[PJC]
3. (Chem.) Easily decomposed or inactivated when subjected to heat, radiation, or mildly acidic or alkaline conditions; -- of chemical compounds; as, enzymes from thermophilic organisms are not as labile as those from mesophiles.[PJC]