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 assibilare could not be parsed. Trying a normal dictionary lookup:
No entries found. Showing closest matches:
as -sībĭlo (ads-), āre, v. n. and a., to hiss, murmur, whisper at or to a thing (only in the post-Aug. poets): alno adsibilat alnus, Claud. Nupt. Hon. et Mar. 68; id. Rapt. Pros. 2, 225: moto adsibilat aëre ventus, Aus. Mos. 258.
As verb act.: serpens animam adsibilat aris, i. e. sibilando amittit, Stat. Th. 5, 578.