Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
mĭnĭātus, a, um, v. 1. minio, P. a.
1. mĭnĭo, no perf., ātum, 1, v. a. [minium], to color with red-lead or cinnabar, to paint red: Jovem, Plin. 33, 7, 38, § 112; 35, 12, 45, § 157.
Hence, mĭnĭātus, a, um, P. a.