Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† sĭcinnista, ae, m., = σικιννιστής, one who performs the sicinnis (a dance of Satyrs), a sicinnis-dancer, Att. ap. Gell. 20, 3, 1 sq., where Gellius calls the dance itself sicinnium (Gr. σίκιννις).