Chrōn'ic or Chrōn'ic-al, a.

a. [Fr. chronique, Lat. chronicus, Gr. χρονικός, concerning time, from χρόνος, time.]

1. Relating to time; according to time. “Partly on a chronical, and partly on a topical method.” J. A. Alexander.
2. Continuing for a long time; lingering.

Chronic disease, one which is inveterate or of long continuance, in distinction from an acute disease, which speedily terminates.