| BFO | balanced forearm orthosis; ball-bearing forearm orthosis; blood-forming organ |
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| LABV | left atrial ball valve |
| ANOV, ANOVA | analysis of variance |
| GENOVA | generalized analysis of variance |
| MANOVA | multivariate analysis of variance |
| MANOVA | 2-multivariate analysis of variance |
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| ANOVA | ANalysis Of VAriance |
| AMOVA | Analyses of molecular variance |
| % CV | coefficient of variance |
| CLV | Corrected Loss Variance |
| ball variance | Swelling and changes in shape and consistency of the ball in a ball-valve prosthesis, especially in one replacing the aortic valve. (05 Mar 2000) |
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| analysis of variance | A statistical technique that isolates and assesses the contributions of categorical independent variables to variation in the mean of a continuous dependent variable. (12 Dec 1998) |
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| variance | 1. The state of being variable, different, divergent, or deviate; a degree of deviation. 2. A measure of the variation shown by a set of observations, defined as the sum of squares of deviations from the mean, divided by the number of degrees of freedom in the set of observations. (05 Mar 2000) |
| variance ratio | The distribution of the ratio of two independent estimates of the same variance from a gaussian distribution based on samples of sizes (n + 1) and (m + 1) respectively. Estimates are usually based on one such sample analyzed in such a way as to make them independent e.g., analysis of variance; and F may be used to test a null hypothesis that the observed differences among sample means is no greater than could readily be accounted for by chance. (05 Mar 2000) |
| genetic variance | Within a population, the measure of how much of the variation of a particular phenotype is due to genotypic variation (as opposed to environmental factors. An example might be the height of a human as determined by genes inherited from the human's parents. See: environmental variance. (09 Oct 1997) |
| environmental variance | Within a population, the measure of how much of the variation of a particular phenotype is due to environmental factors (as opposed to variations in genotype. An example might be the height of a human as determined by such factors as nutrition or infectious diseases during childhood. See: genetic variance. (09 Oct 1997) |
| ulnar variance | <radiology> Ulna minus variance ulna shorter than radius increased frequency of avascular necrosis of lunate associated with DISI, ulna plus variance ulna longer than radius increased stress on triangular fibrocartilage (12 Dec 1998) |
| ball | 1. Any round or roundish body or mass; a sphere or globe; as, a ball of twine; a ball of snow. 2. A spherical body of any substance or size used to play with, as by throwing, knocking, kicking, etc. 3. A general name for games in which a ball is thrown, kicked, or knocked. See Baseball, and Football. 4. Any solid spherical, cylindrical, or conical projectile of lead or iron, to be discharged from a firearm; as, a cannon ball; a rife ball; often used collectively; as, powder and ball. Spherical balls for the smaller firearms are commonly called bullets. 5. A flaming, roundish body shot into the air; a case filled with combustibles intended to burst and give light or set fire, or to produce smoke or stench; as, a fire ball; a stink ball. 6. A leather-covered cushion, fastened to a handle called a ballstock; formerly used by printers for inking the form, but now superseded by the roller. 7. A roundish protuberant portion of some part of the body; as, the ball of the thumb; the ball of the foot. 8. <veterinary> A large pill, a form in which medicine is commonly given to horses; a bolus. 9. The globe or earth. "Move round the dark terrestrial ball." (Addison) Ball and socket joint, a joint in which a ball moves within a socket, so as to admit of motion in every direction within certain limits. Ball bearings, a mechanical device for lessening the friction of axle bearings by means of small loose metal balls. Ball cartridge, a cartridge containing a ball, as distinguished from a blank cartridge, containing only powder. Ball cock, a faucet or valve which is opened or closed by the fall or rise of a ball floating in water at the end of a lever. Ball gudgeon, a pivot of a spherical form, which permits lateral deflection of the arbor or shaft, while retaining the pivot in its socket. Knight. Ball lever, the lever used in a ball cock. Ball of the eye, the eye itself, as distinguished from its lids and socket; formerly, the pupil of the eye. Ball valve, a sort of iron ore, found in loose masses of a globular form, containing sparkling particles. Three balls, or Three golden balls, a pawnbroker's sign or shop. Synonym: See Globe. Origin: OE. Bal, balle; akin to OHG. Balla, palla, G. Ball, Icel. Bollr, ball; cf. F. Balle. Cf. 1st Bale, Pallmall. 1. <chemistry> To heat in a furnace and form into balls for rolling. 2. To form or wind into a ball; as, to ball cotton. Source: Websters Dictionary (01 Mar 1998) |
| ball-and-socket joint | A multiaxial synovial joint in which a more or less extensive sphere on the head of one bone fits into a rounded cavity in the other bone, as in the hip joint. Synonym: articulatio spheroidea, articulatio cotylica, cotyloid joint, enarthrodial joint, enarthrosis, socket joint, spheroid articulation, spheroid joint. (05 Mar 2000) |
| ball of the foot | The padded portion of the sole, at the anterior extremity of the heads of the metatarsals, upon which the weight rests when the heel is raised. (05 Mar 2000) |
| Ball, Sir Charles | <person> Irish surgeon, 1851-1916. See: Ball's operation. (05 Mar 2000) |
| Ball's operation | Division of the sensory nerve trunks supplying the anus, for relief of pruritus ani. (05 Mar 2000) |
| ball thrombus | An antemortem thrombus found in the left or right atrium usually in certain cases of mitral stenosis. (05 Mar 2000) |
| ball valve | Any of a variety of prosthetic cardiac valve's comprised of a ball within a retaining cage affixed to the orifice; when appropriately sized, used in aortic, mitral, or tricuspid position. (05 Mar 2000) |
| ball valve action | The intermittent blockage of a tube or outlet of a cavity by some object or material that permits passage in one direction but not in the other. (05 Mar 2000) |
| ball-valve thrombus | Ball thrombus intermittently occluding the mitral or tricuspid orifice. (05 Mar 2000) |
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