Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
1. mĕrenda, ae, f. [mereo, q. v.], an afternoon luncheon, taken between four and five o’clock (ante- and post-class.): merendam antiqui dicebant pro prandio, quod scilicet medio die caperetur, Paul. ex Fest. p. 123 Müll.: merenda dicitur cibus post meridiem qui datur, Non. 28, 32; Plaut. Most. 4, 2, 49; Afran. ap. Non. 28, 33: serae hora merendae, Calp. Ecl. 5, 60; cf. Isid. Orig. 20, 2, 12.
Also of feed or medicine for a beast: Cyprio bovi merendam, Ennius cum dixit, significat id, quod solet fieri in insulā Cypro, in quā boves humano stercore pascuntur, Paul. ex Fest. p. 59 Müll. (sola, v. 2 Vahl. p. 164).
2. Merenda, ae, m., a Roman surname: T. Antonius Merenda, a consul, A. U. C. 304, Liv. 3, 35.