Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† harmŏnĭcē, ēs, f., = ἁρμονική, the science of sounds, harmonics, Vitr. 5, 3, 8.
Called harmŏnĭca, ae, f., Vitr. 5, 4, 1.