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From The Collaborative International Dictionary of English v.0.48:
Chronic \Chron"ic\, a. [L. chronicus, Gr. ? concerning time, from ? time: cf. F. chronique.] 1. Relating to time; according to time. [1913 Webster] 2. Continuing for a long time; lingering; habitual. [1913 Webster] Chronic disease, one which is inveterate, of long continuance, or progresses slowly, in distinction from an acute disease, which speedly terminates. [1913 Webster]