Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ăb-usque, prep. (vox Vergil.), even from, as far as from, like ab constr. with abl.: Siculo prospexit abusque Pachyno, Verg. A. 7, 289: animalia maris Oceano abusque petiverat, Tac. A. 15, 37; so App. Mag. p. 311 med.; Amm. 19, 4 al. (in Plaut. Am. 1, 1, 97, the correct read. is usque).