Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
plasmo, āvi, ātum, 1, v. a. [plasma], to form, mould, fashion (eccl. Lat.): corporis effigiem, Prud. Apoth. 933: homo plasmatus, Tert. adv. Jud. 13 med.: me, Vulg. Psa. 118, 73: aestatem, id. ib. 73, 17.