in·ter·ca·la·ry /ɪnˈtɝkəˌlɛri, ˌɪntɚ/
 (a.)閏的,插入中間的,被夾于中間的


 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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 intercalary
      adj : added or having an addition to make the calender year
            correspond to the solar year; "Feb. 29 is an
            intercalary day"; "leap year is an intercalary year"