Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ar-vĕho, exi, ectum, 3, v. a. (an old form for adveho, v. ad init.), to bring, to procure (only twice in Cato): arvehant ligna, Cato, R. R. 138: trapetum ubi arvectum erit, id. ib. 135, 7.