| crab | 1. A crustacean, many varieties of which are edible. 2. An insect, the crab louse, Pthirus pubis. (05 Mar 2000) |
|---|---|
| crab hand | An infection caused by erysipelothrix rhusiopathiae that is almost wholly restricted to persons who in their occupation handle infected fish, shellfish, poultry, or meat. Three forms of this condition exist: a mild localised form manifested by local swelling and redness of the skin; a diffuse form that might present with fever; and a rare systemic form associated with endocarditis. (12 Dec 1998) |
| crab yaws | <dermatology> Yaws of the feet with keratoderma of the palms and soles and ulcer formation. Synonym: crab yaws, dumas, tubba, tubbae. (05 Mar 2000) |
| crabs | Chiefly marine, largely carnivorous crustaceans including the genera cancer, uca, and callinectes. It includes crabs as food. (12 Dec 1998) |
| Crabtree effect | Inhibition of cellular respiration of isolated systems by high concentrations of glucose; a "reciprocal" of Pasteur's effect; due, in part, to the inhibition of hexokinase by elevated glucose-6-phosphate. Compare: Pasteur's effect. (05 Mar 2000) |
| Crabtree, Herbert | <person> 20th century English physician and biochemist. See: Crabtree effect. (05 Mar 2000) |
| crack | A fissure or fracture. Caused by the effects of stress on weak or weakened parts of a material. To break a large, complex compound into simpler compounds. To open something slightly. A narcotic drug illegal in most countries which is a cheaper, more addictive, smokeable version of cocaine (another illegal narcotic) with more adverse effects on the user than cocaine. (09 Oct 1997) |
| crack cocaine | The purified, alkaloidal, extra-potent form of cocaine. It is smoked (free-based), injected intravenously, and orally ingested. Use of crack results in alterations in function of the cardiovascular system, the autonomic nervous system, the central nervous system, and the gastrointestinal system. There are concomitant psychological and social alterations as well. The slang term "crack" was derived from the crackling sound made upon igniting of this form of cocaine for smoking. (12 Dec 1998) |
| cracked heel | Hyperkeratosis and fissure formation on the soles. Synonym: cracked heel. (05 Mar 2000) |
| cracked tooth syndrome | <syndrome> A toothache caused by a broken tooth (tooth fracture) without associated cavity or advanced gum disease. Biting on the area of tooth fracture can cause severe sharp pains. These fractures are usually due to chewing or biting hard objects such as hard candies, pencils, nuts, etc. Sometimes, the fracture can be seen by painting a special dye on the cracked tooth. Treatment usually is to protect the tooth with a crown. However, if placing a crown does not relieve pain symptoms, a root canal procedure may be necessary. (12 Dec 1998) |
| cracked-pot resonance | A peculiar sound, resembling that heard on striking a cracked pot, elicited on percussing over a pulmonary cavity that commmunicates with a bronchial tube, when the patient's mouth is open. Synonym: cracked-pot sound. (05 Mar 2000) |
| cracked-pot sound | A peculiar sound, resembling that heard on striking a cracked pot, elicited on percussing over a pulmonary cavity that commmunicates with a bronchial tube, when the patient's mouth is open. Synonym: cracked-pot sound. (05 Mar 2000) |
| crackle | Short, sharp, or rough sounds heard with a stethoscope over the chest. Most often heard in pleurisy with fibrinous exudate. Origin: echoic (05 Mar 2000) |
| crackling jaw | Chronic subluxation with clicking on motion. (05 Mar 2000) |
| crackling rale | Very fine sounds produced by fluid in very small airways in pneumonia or congestive heart failure. (05 Mar 2000) |