QUARTAN, quort'an. [Latin quartanus, the fourth.] Designating the fourth; occurring every fourth day; as a quartan ague or fever. QUART'AN, noun 1. An intermitting ague that occurs every fourth day, or with intermissions of seventy two hours. 2. A measure containing the fourth part of some other measure.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI