Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
‡ bua, ae, f. [bu, Paul. ex Fest. s. v. im butum, p. 109 Müll.], the natural sound made by infants in asking for their drink, as pappa for their food, Varr. ap. Non. p. 81, 1 sq.; cf. vinibua.