| BLB | Baker-Lima-Baker [mask]; Bessey-Lowry-Brock [method or unit]; black light bulb; Boothby-Lovelace-Bul... |
|---|---|
| BVM | bag-valve-mask; bronchovascular markings; Bureau of Veterinary Medicine |
| CFM | chlorofluoromethane; close-fitting mask; craniofacial microsomia |
| EOMA | emergency oxygen mask assembly |
| FATS | face and thigh squeeze [position for bag mask ventilation] |
| BVM | Bag Valve Mask |
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| LM | Laryngeal Mask |
| LMA | Laryngeal Mask Airway |
| FM | face mask |
| ILMA | intubating laryngeal mask airway |
mask (°¡¸é, ¸¶½ºÅ©, ¾È¸é ºØ´ë
mouth to mask breathing
| shadow mask | <microscopy> Also Aperture mask. In colour video monitors, a finely perforated or striped metal plate that is located between the three electron guns and the phosphor screen. The mask ensures that the electron beams carrying the R, G, and B signals land on the corresponding phosphors at every point in the picture. (05 Aug 1998) |
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| mask | 1. A cover, or partial cover, for the face, used for disguise or protection; as, a dancer's mask; a fencer's mask; a ball player's mask. 2. That which disguises; a pretext or subterfuge. 3. A festive entertainment of dancing or other diversions, where all wear masks; a masquerade; hence, a revel; a frolic; a delusive show. "This thought might lead me through the world's vain mask." (Milton) 4. A dramatic performance, formerly in vogue, in which the actors wore masks and represented mythical or allegorical characters. 5. A grotesque head or face, used to adorn keystones and other prominent parts, to spout water in fountains, and the like; called also mascaron. 6. In a permanent fortification, a redoubt which protects the caponiere. A screen for a battery. 7. <zoology> The lower lip of the larva of a dragon fly, modified so as to form a prehensile organ. Mask house, a house for masquerades. Origin: F. Masque, LL. Masca, mascha, mascus; cf. Sp. & Pg. Mascara, It. Maschera; all fr. Ar. Maskharat buffoon, fool, pleasantry, anything ridiculous or mirthful, fr. Sakhira to ridicule, to laugh at. Cf. Masque, Masquerade. Source: Websters Dictionary (01 Mar 1998) |
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| mask of pregnancy | <medicine> A dark discolouration of the skin, usually local; as, Addison's melasma, or Addison's disease. Melasmic. Origin: NL, fr. Gr. Black spot. Source: Websters Dictionary (01 Mar 1998) |
| mask shell | <zoology> Any spiral marine shell of the genus Persona, having a curiously twisted aperture. Source: Websters Dictionary (01 Mar 1998) |
| Hutchinson's mask | The sensation experienced in tabetic neurosyphilis as if the face were covered with a mask or with cobwebs. (05 Mar 2000) |
| nonrebreathing mask | A mask 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 mask. (05 Mar 2000) |
| ecchymotic mask | A dusky discoloration of the head and neck occurring when the trunk has been subjected to sudden and extreme compression, as in traumatic asphyxia. (05 Mar 2000) |
| tropical mask | A bronze-coloured pigmentation, probably produced by hormone imbalance, occurring in gradually increasing areas on the face, neck, and chest in persons exposed continuously to the tropical sun; similar to chloasma of the temperate zone, but intensified because of strong sunlight. Synonym: tropical mask. (05 Mar 2000) |
| laryngeal mask | A tubular oropharyngeal airway with an inflatable rim at the distal end that when inflated creates an airtight seal immediately above the larynx. (05 Mar 2000) |
| luetic mask | A dirty brownish yellow pigmentation, blotchy in character, resembling that of chloasma, occurring on the forehead, temples, and sometimes the cheeks in patients with tertiary syphilis. (05 Mar 2000) |
| acoustic shadow | Sonographic appearance of reduced echo amplitude from regions lying beyond an attenuating object. Compare: acoustic enhancement. (05 Mar 2000) |
| Ponfick's shadow | A hypochromic, crescent-shaped erythrocyte, probably resulting from artifactual rupture of a red cell with loss of haemoglobin. Synonym: achromacyte, achromatocyte, ghost corpuscle, phantom corpuscle, Ponfick's shadow, shadow corpuscle, shadow, Traube's corpuscle. Origin: G. A-priv. + chroma, colour, + kytos, hollow (cell) (05 Mar 2000) |
| scissors-shadow | A distorted image seen in mixed astigmatism by retinoscopy. (05 Mar 2000) |
| hilar shadow | Radiographic hilum of the lung; a composite radiographic shadow of the central pulmonary arteries and veins, with associated bronchial walls and lymph nodes, within the right or left lung. (05 Mar 2000) |
| shadow | 1. Shade within defined limits; obscurity or deprivation of light, apparent on a surface, and representing the form of the body which intercepts the rays of light; as, the shadow of a man, of a tree, or of a tower. See the Note under Shade. 2. Darkness; shade; obscurity. "Night's sable shadows from the ocean rise." (Denham) 3. A shaded place; shelter; protection; security. "In secret shadow from the sunny ray, On a sweet bed of lilies softly laid." (Spenser) 4. A reflected image, as in a mirror or in water. 5. That which follows or attends a person or thing like a shadow; an inseparable companion; hence, an obsequious follower. "Sin and her shadow Death." (Milton) 6. A spirit; a ghost; a shade; a phantom. "Hence, horrible shadow!" 7. An imperfect and faint representation; adumbration; indistinct image; dim bodying forth; hence, mystical reprresentation; type. "The law having a shadow of good things to come." (Heb. X. 1) "[Types] and shadows of that destined seed." (Milton) 8. A small degree; a shade. "No variableness, neither shadow of turning." 9. An uninvited guest coming with one who is invited. "I must not have my board pastered with shadows That under other men's protection break in Without invitement." (Massinger) Shadow of death, darkness or gloom like that caused by the presence or the impending of death. Origin: Originally the same word as shade. See Shade. 1. To cut off light from; to put in shade; to shade; to throw a shadow upon; to overspead with obscurity. "The warlike elf much wondered at this tree, So fair and great, that shadowed all the ground." (Spenser) 2. To conceal; to hide; to screen. "Let every soldier hew him down a bough. And bear't before him; thereby shall we shadow The numbers of our host." (Shak) 3. To protect; to shelter from danger; to shroud. "Shadoving their right under your wings of war." (Shak) 4. To mark with gradations of light or colour; to shade. 5. To represent faintly or imperfectly; to adumbrate; hence, to represent typically. "Augustus is shadowed in the person of neas." (Dryden) 6. To cloud; to darken; to cast a gloom over. "The shadowed livery of the burnished sun." (Shak) "Why sad? I must not see the face O love thus shadowed." (Beau & Fl) 7. To attend as closely as a shadow; to follow and watch closely, especially in a secret or unobserved manner; as, a detective shadows a criminal. Origin: OE. Shadowen, AS. Sceadwian. See adow. Source: Websters Dictionary (01 Mar 1998) |
| shadow-casting | Deposition of a film of carbon or certain metals such as palladium, platinum, or chromium on a contoured microscopic object in order to allow the object to be seen in relief with the electron microscope or sometimes with the light microscope. (05 Mar 2000) |
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