Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ĭn-argento, āvi, ātum, 1, v. a. [in-argentum], to overlay with silver, to silver: aes, Paul. Sent. 5, 25, 5.
Mostly Part.: ĭnargentātus, a, um, overlaid with silver, silvered over (post-Aug.): lamina aerea, Plin. 21, 2, 3, § 5: lecti, Dig. 33, 10, 3 praef. § 3.