a. [ L. intercalaris, intercalarius: cf. F. intercalaire. See Intercalate. ] [ 1913 Webster ] 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. [ 1913 Webster ] 2. Introduced or inserted among others; additional; supernumerary. “Intercalary spines.” Owen. [ 1913 Webster ] This intercalary line . . . is made the last of a triplet. Beattie. [ 1913 Webster ]
Intercalary day (Med.), one on which no paroxysm of an intermittent disease occurs. Mayne. [ 1913 Webster ]
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