1. 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.

2. Introduced or inserted among others; additional; supernumerary. "Intercalary spines." "This intercalary line . . . Is made the last of a triplet.

<medicine>" (Beattie) Intercalary day, one on which no paroxysm of an intermittent disease occurs.

Origin: L. Intercalaris, intercalarius: cf. F. Intercalaire. See Intercalate.

(01 Mar 1998)

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