In·ter·ca·la·ry a.
1. Chron. Inserted or introduced among others in the calendar; as, an intercalary month, day, etc.; -- now applied particularly to the odd day (Feb. 29) inserted in the calendar of leap year. See Bissextile, n.
2. Introduced or inserted among others; additional; supernumerary. “Intercalary spines.”
This intercalary line . . . is made the last of a triplet. --Beattie.
Intercalary day Med., one on which no paroxysm of an intermittent disease occurs.
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