What is the lower lip of the larva of a dragon fly, modified so as to form a prehensile organ. Mask house, a house for masquerades. [Obs.] called?

mask — (Zoöl.) The lower lip of the larva of a dragon fly, modified so as to form a prehensile organ. Mask house, a house for masquerades. [Obs.]. (Webster's 1913.)

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