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plural nasopharynxes or nasopharynges
(anatomy) The nasal part of the pharynx, lying behind the nose and above the level of the soft palate. quotations examples
Occasionally she gasped out "Joe!" — a flat animal cry that her slack vocal cords made unfemininely deep, that her nasopharynx, choked with mucus, robbed of all resonance.
1959, Anthony Burgess, Beds in the East (The Malayan Trilogy), published 1972, page 506