| 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) |
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| 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) |