(mask, mäsk) noun
1. A cover or disguise, as for the features; a protective appliance for the face or head: a gas mask.
2. A subterfuge.
3. A cast of the face taken just after death.
4. A play or dramatic performance, in vogue in the 16th and 17th centuries, in which the actors were masked and represented allegorical or mythological subjects, originally in dumb show, but later in dialog, poetry, and song; also, a dramatic composition written for such a play: also spelled masque.
5. A masquerade: also spelled masque.
6. A masker.
7. An artistic covering for the face, used by Greek and Roman actors in comedy and tragedy.
8. Archit. A reproduction of a face or a face and neck, used as a gargoyle, a keystone of an arch, etc.
9. Mil. A screen of brush or the like for hiding a battery or any military operation from the enemy; camouflage.
10. Zool. Any formation about the head suggesting a mask; specifically, the enlarged lower lip of a larval dragonfly.
11. A fox's or dog's head. See synonyms under PRETENSE.
—v.t.
1. To cover (the face, head, etc.) with a mask.
2. To hide or conceal with or as with a mask; disguise.
—v.i.
3. To put on a mask; assume a disguise. [<F masque <Ital. maschera, mascara <Arabic maskharah a buffoon] Synonyms (verb): cloak, conceal, cover, disguise, dissemble, hide, masquerade, pretend, screen, shroud, veil. See HIDE. Antonyms: betray, communicate, declare, disclose, divulge, exhibit, expose, publish, reveal, show, tell.
MASKS
a. Greek tragedy. b. Greek comedy. c. Tibetan ceremonial. d. Ancient Shinto. e. Domino.

(mask, mäsk) v.t. & v.i. Brit. Dial.
To infuse or be infused. [Var. of MASH]