The Collaborative International Dictionary
Semiditone
Semiditone \Sem`i*di"tone`\, n. [Pref. semi- + ditone: cf. It. semiditono. Cf. Hemiditone.] (Gr. Mus.) A lesser third, having its terms as 6 to 5; a hemiditone.
Wiktionary
semiditone
n. (context music English) The lesser third, having its terms as 6 to 5; a hemiditone.