| 1. | using or wearing a mask or masks: a masked burglar; masked actors. |
| 2. | disguised; concealed; hidden: masked treachery; masked forces. |
| 3. | Botany. personate 2 (def. 1). |
| 4. | Zoology. having markings that resemble a mask. |
| 1. | a covering for all or part of the face, worn to conceal one's identity. |
| 2. | a grotesque or humorous false face worn at a carnival, masquerade, etc.: Halloween masks. |
| 3. | Also called swim mask. a device consisting typically of a transparent glass or plastic panel fitted into a flexible rubber gasket that fits snugly around the eyes, over the cheeks, and usually over the nose: used by skin divers. |
| 4. | anything that disguises or conceals; disguise; pretense: His politeness is a mask for his fundamentally malicious personality. |
| 5. | a likeness of a face, as one molded on the face in plaster. Compare death mask, life mask. |
| 6. | a covering of wire, gauze, etc., to protect the face, as from splinters, dust, or a pitched ball. |
| 7. | gas mask. |
| 8. | any protective covering for the face or head. |
| 9. | any protective covering, as paper, cardboard, plastic, or the like, used for masking an area of something, as of a photograph or window. |
| 10. | the dark shading on the muzzle of certain dogs. |
| 11. | a representation of a face or head, generally grotesque, used as an architectural ornament or as a decorative device in weaponry, furniture, etc. |
| 12. | a person wearing a mask; masker. |
| 13. | masque (defs. 1–3). |
| 14. | Also, masque. a cosmetic cream, gel, paste, or the like, that is applied to the face and allowed to remain for a short time before being removed and is used for tightening, cleansing, refreshing, or lubricating the skin. |
| 15. | a piece of cloth, silk, or plastic material covering the face of an actor to symbolize the character being represented: used in Greek and Roman drama and in some modern plays. |
| 16. | the face or head, as of a fox. |
| 17. | Electronics. a type of stencil applied to the surface of a semiconductor to permit selective etching or deposition: used in the manufacture of integrated circuits by photolithography. |
| 18. | Fortification. a screen, as of earth or brush, for concealing or protecting a battery or any military operation. |
| 19. | Also called braker. Shipbuilding. a sliding timber construction braced against the stern of a hull being launched to keep it from entering the water too rapidly. |
| 20. | to disguise or conceal; hide; dissemble: to mask one's intentions. |
| 21. | to cover or conceal with a mask. |
| 22. | to cover or shield a part of (a design, picture, etc.) in order to prevent reproduction or to protect the surface from the colors used, as in working with an air brush or in painting. |
| 23. | Fortification. to conceal (a battery or any military operation) from the enemy. |
| 24. | to hinder, as an army, from conducting an operation. |
| 25. | to put on a mask; disguise oneself. |

mask (māsk) n.
v. tr.
[French masque, from Italian maschera, from Medieval Latin masca, specter, witch, mask.] mask'a·ble adj. |
mask (māsk)
n.
A covering for the nose and mouth that is used for inhaling oxygen or an anesthetic.
A covering worn over the nose and mouth, as by a surgeon or dentist, to prevent infection.
A facial bandage.
Something, often a trait, that disguises or conceals.
Any of a various of conditions producing alteration or discoloration of the skin of the face.
An expressionless appearance of the face seen in certain diseases, such as Parkinsonism.
To cover with a protective mask.
To cover in order to conceal, protect, or disguise.
masked adj.
Latent or hidden, as a symptom or disease.
Having masklike markings on the head or face.
Having the anatomy of the next developmental form outlined beneath the integument, as in certain insect pupae.