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