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(mă-lerʺ-ē-olʹŏ-jē) [malaria + -logy] The scientific study of malaria.


(malʺă-sēzʹē-ă) [Louis Charles Malassez, Fr. physiologist, 1842–1909] A genus of fungi that is a common cause of superficial skin infections. The organisms are lipophilic. In hospitals, malassezia infections tend to occur in patients receiving lipid infusions. Malassezia infections of the bloodstream result in sepsis.

M. pachydermatis A species that has been transferred from the pet dogs of health care workers to the infants in a neonatal unit.


(malʺă-simʺĭ-lāʹshŏn) [mal- + assimilation] Defective, incomplete, or faulty assimilation, esp. of nutritive material. SEE: malabsorption syndrome.


(māʹlātʺ) [mal(ic acid) + -ate] A salt or ester of malic acid.


(malʺă-thīʹŏn) An organophosphate that inhibits the enzyme cholinesterase. It is used as a pesticide and has a lower toxicity for mammals than parathion. SEE: parathion.

mal de ojo

(malʹdā ōʹhō) [Sp. mal de ojo, evil eye] In many Hispanic cultures, the evil eye. SEE: evil eye.


(malʹdi-sentʹʺ) [mal- + Fr. descente] Failed or incomplete movement of the testes to the scrotum during fetal development.


(mălʺdī-jĕsʹchŭn) Disordered digestion.


(māl) [Fr. male, masle, fr. L. masculus, masculine] 1. Masculine. 2. The sex that has organs for producing sperm for fertilization of ova.

male erectile disorder

The persistent or recurrent inability to attain, or to maintain until completion of the sexual activity, an adequate erection. The disturbance causes marked distress or interpersonal difficulty. The difficulty cannot be attributed to a medical condition, substance abuse, or medications. SEE: erectile dysfunction; female sexual arousal disorder.

male factor

SEE: under factor.

male fern

A common fern (Dryopteris filix-mas) native to the temperate regions of Europe, Asia, and North America. Its root was formerly used as an anthelmintic against tapeworms but has been replaced by less toxic and more effective drugs. SEE: aspidium.


(mă-lefʹĭ-sĕns) [L. maleficentia, evildoing] Acting in a deliberately harmful manner toward others.


(malʺfor-māʹshŏn) [mal- + formation] Abnormal shape or structure, esp. one that is congenital; deformity.

arteriovenous m. ABBR: AVM. 1. Angiodysplasia. 2. An abnormal connection between an artery and a vein.

spinal cavernous m. A cavernous malformation in the spinal ...

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