Lewis & Short

Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.

chrōma, ătis (ătŏs, Vitr. 5, 5), n., = χρῶμα (a color), in music, a chromatic scale (a species of harmony in which the tones of the tetrachord measure two and a half tones, as a half, again a semitone, and then a tone and a half follow each other), Vitr. 5, 4, 3; cf. Dict. of Antiq. p. 645.
Hence, chrōmătĭcē, ēs, f., the science of this species of harmony, Vitr. 5, 5; and: chrō-mătĭcus, a, um, adj., chromatic: genus, the same, Macr. Somn. Scip. 2, 4 fin.