[Fr. masque, disguise]

1. A covering for the face that serves as a protective barrier.
SEE: bag mask device; SEE: respirator
2. The immobile appearance of the face occurring in certain pathological conditions.
3. To conceal or prevent detection.
4. A change in facial pigmentation resulting from pregnancy or from disease.

aerosol mask

A mask used for the therapeutic administration of a nebulized solution, humidity, or high airflow with oxygen enrichment. It has a large-bore inlet and an exhalation port.

BLB mask

A mask used for administering oxygen to persons at high altitudes (such as aviators) or to patients during anesthesia.

cloth mask

A covering made from household fabrics, used to filter droplets and particles.

ecchymotic mask

Cyanotic facies accompanying traumatic asphyxia.

face mask

1. A barrier device used in infection control to prevent health care providers from breathing or coughing on patients. It is also employed to prevent patients' sneezes and sputum from making contact with the health care provider's face or eyes or from being inhaled.
2. A device that covers the mouth, nose, or both of a patient who requires positive-pressure, noninvasive ventilation or continuous positive pressure-ventilation (CPAP).

high air flow with oxygen enrichment mask

ABBR: HAFOE mask A term applied to Venturi-type devices.
SEE: Venturi mask

Hutchinson mask

SEE: Hutchinson, Sir Jonathan

luetic mask

Blotchy brown pigmentation of cheeks, forehead, and temples, seen in tertiary syphilis.

medical mask

SYN: SEE: surgical mask

Mikulicz mask

SEE: Mikulicz-Radecki, Johann von

N95 mask

SEE: N95 respirator.

nonrebreathing mask

An oxygen administration device with one-way valves for inspiration and expiration and a reservoir bag, used to attain high concentrations of oxygen.

oxygen mask

A device that fits over the mouth and nose and provides oxygen or other therapeutic gas. It includes a simple, partial rebreathing type and a nonrebreathing type.

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OXYGEN MASKS (A) Simple mask. (B) Partial rebreather mask. (C) Nonrebreathing mask. (D) Venturi mask.

Parkinson mask

A colloquialism for Parkinson facies.

pocket face mask

A folding mask that can be carried in a pocket and used for artificial ventilation. Most pocket face masks have an inlet for oxygen and a one-way valve for infection control.

mask of pregnancy

SEE: Chloasma gravidarum.

surgical mask

A single-use filtration device made of fabric and worn over the nose and mouth of surgical staff to prevent contamination of the operative field and to protect the wearer from splashes and splatter.
SYN: SEE: medical mask

ventilation mask

A face mask device that applies mechanical ventilation.

Venturi mask

SEE: Venturi mask