Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
The word interserere could not be parsed. Trying a normal dictionary lookup:
No entries found. Showing closest matches:
1. inter-sĕro, sēvi, sĭtum, 3, v. a. [1. sero],
2. inter-sĕro, sĕrŭi, sertum, 3, v. a. [2. sero], to put or place between, to interpose, add: causam interserens, Nep. Milt. 4, 1: oscula mediis verbis, Ov. M. 10, 559.