Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
prae-signo, āre, v. a., to mark before (ante-class. and post-Aug.): ad summum praesignato (al. pertundito), Cato, R. R. 154: furunculos, Plin. 28, 4, 7, § 36.