mask

1. Any of a variety of disease states producing alteration or discoloration of the skin of the face. 2. The expressionless appearance seen in certain diseases; e.g., Parkinson facies. 3. A facial bandage. 4. A shield designed to cover the mouth and nose for maintenance of antiseptic conditions. 5. A device designed to cover the mouth and nose for administration of inhalation anesthetics, oxygen, or other gases.

- ecchymotic m. a dusky discoloration of the head and neck occurring when the trunk has been subjected to sudden and extreme compression, as in traumatic asphyxia.

- Hutchinson m. the sensation experienced in tabetic neurosyphilis as if the face were covered with a m. or with cobwebs.

- laryngeal m. a tubular oropharyngeal airway with an inflatable rim at the distal end that when inflated creates an airtight seal immediately above the larynx.

- nonrebreathing m. a m. fitted with both an inhalation valve and an exhalation valve so that all exhaled gas is vented to the external atmosphere and inhaled gas comes only from a reservoir connected to the m..

- tropical m. SYN: chloasma bronzinum.

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Medical Anatomy Segmentation Kit

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mask 'mask n

1) a protective covering for the face

2 a) any of various devices that cover the mouth and nose and are used to prevent inhalation of dangerous substances, to facilitate delivery of a gas (as oxygen or a general anesthetic), or to prevent the dispersal of exhaled infective material see gas mask, oxygen mask

3) a cosmetic preparation for the skin of the face that produces a tightening effect as it dries

mask vt

1) to prevent (an atom or group of atoms) from showing its ordinary reactions <to \mask hydroxyl in a sugar by converting it into methoxyl>

2) to modify or reduce the effect or activity of (as a process or a reaction)

3) to make indistinct or imperceptible <flavorings used in pharmacy to \mask the taste of medications>

4) to raise the audibility threshold of (a sound) by the simultaneous presentation of another sound

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(mask) 1. a covering for the face, such as a bandage, an apparatus for administering oxygen, or a cloth for prevention of spread of droplets from the nose and mouth. 2. to cover or conceal the true nature of something, such as of a disorder by unrelated symptoms. See masked. 3. to interfere with processing of a stimulus; see masking. 4. in dentistry, to camouflage metal parts of a prosthesis by covering with opaque material.