Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
* mĕrōbĭbus, a, um, adj. [merum-bibo], that drinks wine unmixed (which among the ancients was the practice only of drunkards): anus multibiba atque merobiba, Plaut. Curc. 1, 1, 77.