Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
prăsĭnĭānus, a, um, adj. [prasinus], leekgreen, prasinian (post-class.): equus, i. e. of the leek-green party of charioteers in the circus, Capit. Ver. 6: si prasinianus es, Petr. 70.