Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
obsōnātus (ops-), ūs, m. [id..], a catering, marketing: dare minam in obsonatum, Plaut. Truc. 4, 2, 27: obsonatu redeo, id. Men. 2, 2, 5 and 14.
1. obsōno or ops-, āvi, ātum, 1, v. a., and obsōnor or ops-, ātus, 1, v. dep. [ὀψωνέω], to buy provisions, to cater, purvey (class.).
2. ob-sŏno, 1, v. a., to interrupt by a sound; trop.: alicui sermone, i. e. to interrupt by speaking, Plaut. Ps. 1, 2, 74.