'Intercalary day' definitions:

Definition of 'Intercalary day'

From: GCIDE
  • Intercalary \In*ter"ca*la*ry\ (?; 277), 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]