Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
* ŏb-ātrātus, a, um, adj., obscured, black, blackish: nascens luna si cornu superiore obatrato surget, pluvias decrescens dabit, Varr. ap. Plin. 18, 35, 79, § 349 Sillig. N. cr. (al. obatro).