n. [ OF. accide, accidie, LL. accidia, acedia, fr. Gr. &unr_;; 'a priv. + &unr_; care. ] Sloth; torpor. [ Obs. ] “The sin of accidie.” Chaucer. [ 1913 Webster ]
a. (Min.) 1. Containing a high percentage of silica; -- opposed to basic. [ 1913 Webster ]
2. of or relating to acid; having the character of an acid, as an acidic solution. [ PJC ]