codonostomeBiol. Oftener in Lat. form codoˈnostoma. [f.Gr. κώδων bell + στόµα mouth.] ‘The bell-shaped aperture of the disc of a medusa{ddd}or the mouth of a medusiform gonophore’ (Syd. Soc.Lex.). 1870Nicholson Zool. 85 The term ‘codonostoma’ has been proposed to designate the open mouth of the bell.