In*ter"ca*la*ry (?; 277), a. [L.
intercalaris, intercalarius: cf. F.
intercalaire. See Intercalate.]
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."
Owen.
This intercalary line . . . is made the last of
a triplet.
Beattie.
Intercalary day (Med.), one on which
no paroxysm of an intermittent disease occurs.
Mayne.