Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
The word serenari could not be parsed. Trying a normal dictionary lookup:
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Sĕrēna, ae, f., a Roman female name; esp., the wife of Stilicho, eulogized by Claudian, v. Claud. Laud. Ser.
Sĕrēnātor, ōris, m. [sereno], he that makes fair weather, the clearer-up, an epithet of Jupiter, App. de Mundo, p. 75, 7; Inscr. Gud. p. 3, n. 8; p. 3, n. 9; p. 4, n. 1 sq.; cf. serenus.
2. Sĕrēnus, i, m.; Sĕrēna, ae, f. [1. serenus], a proper name.