We don't have synonyms for rasante yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are asante and rasant.
(adj) :
(military, historical) Sweeping; grazing; applied to a style of fortification in which the command of the works over each other, and over the country, is kept very low, so that the shot may more effectually sweep or graze the ground before them
(adj) :
(military, historical) Sweeping; grazing; applied to a style of fortification in which the command of the works over each other, and over the country, is kept very low, so that the shot may more effectually sweep or graze the ground before them