| undershrieve | <botany> A low shrub; a woody plant of low stature. Source: Websters Dictionary (01 Mar 1998) |
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| underspore | To raise with a spar, or piece of wood, used as a lever. "Give me a staff that I may underspore." (Chaucer) Source: Websters Dictionary (01 Mar 1998) |
| understain | <technique> To stain less deeply than usual. (05 Mar 2000) |
| understory | The trees and other woody species growing under a relatively continuous cover of branches and foliage formed by the overstory trees. (05 Dec 1998) |
| underventilation | A state in which there is a reduced amount of air entering the pulmonary alveoli. (18 Nov 1997) |
| underwinding | The effect of negative supercoiling on a structure of DNA. (05 Mar 2000) |
| underwing | 1. <zoology> One of the posterior wings of an insect. 2. <zoology> Any one of numerous species of noctuid moths belonging to Catocala and allied genera, in which the hind wings are banded with red and black or other conspicuous colours. Many of the species are called red underwing. Source: Websters Dictionary (01 Mar 1998) |
| underwood | Small trees and bushes that grow among large trees; coppice; underbrush; formerly used in the plural. "Shrubs and underwoods look well enough while they grow within the shade of oaks and cedars." (Addison) Source: Websters Dictionary (01 Mar 1998) |
| Underwood's disease | A severe, sometimes fatal, disorder of adipose tissue occurring chiefly in preterm or debilitated infants suffering from an underlying illness and manifested by a diffuse, nonpitting induration of the affected tissue. The skin becomes cold, yellowish, mottled, and inflexible. (12 Dec 1998) |
| undescended testis | A testis that has failed to descend into the scrotum; there are palpable and unpalpable (impalpable) variants. Synonym: cryptorchid testis. (05 Mar 2000) |
| undetermined nitrogen | The nitrogen of blood, urine, etc., other than urea, uric acid, amino acids, etc., that can be directly estimated; in blood it amounts to about 25 mg per 100 ml. Urea nitrogen, the portion of nitrogen in a biological sample, such as blood or urine, that derives from its content of urea. See: blood urea nitrogen. (05 Mar 2000) |
| undifferentiated | <embryology, pathology> An immature, embryonic or primitive cell. It has a non-specific appearance with multiple non-specific activities and functions poorly. See: differentiate, dedifferentiate. (16 Dec 1997) |
| undifferentiated abdominal malignancy | <radiology> Large soft-tissue masses, multiple linear or nodular calcific densities, can coalesce to form conglomerate masses (12 Dec 1998) |
| undifferentiated cell | A primitive cell that has not assumed the morphologic and functional characteristics it will later acquire. (05 Mar 2000) |
| undifferentiated cell adenoma | <tumour> An adenoma of the hypophysis composed of cells for which there is no overt evidence or hormone production, but which usually produces hypopituitarism and visual disturbances by compression of adjacent structures; approximately one third of these tumours have cells with abundant mitochondria (oncocytes) that are somewhat larger than the monocytic null cells. Synonym: undifferentiated cell adenoma. (05 Mar 2000) |