noun,pluralci·cis·be·i[chee-chiz-bey-ee or, older use, si-sis-bee-ee; Italian chee-cheez-be-ee]. /ˌtʃi tʃɪzˈbeɪ i or, older use, sɪˈsɪs biˌi; Italian ˌtʃi tʃizˈbɛ i/. (esp. in Italy during the 17th and 18th centuries)
an escort or lover of a married woman.
nounplural-bei (-ˈbɛːi)
the escort or lover of a married woman, esp in 18th-century Italy