Pessary \Pes"sa*ry\ (p[e^]s"s[.a]*r[y^]), n.; pl. {Pessaries}.
[L. pessarium, pessum, pessus, Gr. pesso`s: cf. F. pessaire.]
(Med.)
(a) An instrument or device to be introduced into and worn in
the vagina, to support the uterus, or remedy a
malposition.
(b) A medicinal substance in the form of a bolus or mass,
designed for introduction into the vagina; a vaginal
suppository.
[1913 Webster]