intercalary
/ɪnˈtɜːkələrɪ/adjective
1
- (of a day or a month) inserted in the calendar to harmonize it with the solar year, e.g. 29 February in leap years（日期, 月份）闰的。
1.1
- (of an academic year or period) additional to the standard course and taken at a different institution（学年, 学期）课程计划之外的; 在外校完成的。
1.2
- of the nature of an insertion插入的：
elaborate intercalary notes and footnotes.
详细的插入注释和脚注。
2
- Botany (of the meristem of a plant) located between its daughter cells, especially (in a grass) at or near the base of a leaf【植】（植物分生组织）位于子细胞间的, 居间的, 间生的（尤指位于禾草类叶基部的）。
词源
early 17th cent.: from Latin intercalarius, from intercalare （see INTERCALATE）.