GNU Collaborative International Dictionary of English

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1.       
   ‖Mastax , n. [NL., fr. Gr.  mouth, jaws.] (Zool.) (a) The pharynx of a rotifer. It usually contains four horny pieces. The two central ones form the incus, against which the mallei, or lateral ones, work so as to crush the food. (b) The lore of a bird.
   1913 Webster