| underlocker | <chemical> A person who inspects a mine daily. Synonym: underviewer. Source: Websters Dictionary (01 Mar 1998) |
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| undermining ulcer | A chronic cutaneous ulcer with overhanging margins; due to haemolytic streptococci or other bacteria. (05 Mar 2000) |
| undernutrition | A form of malnutrition resulting from a reduced supply of food or from inability to digest, assimilate, and utilise the necessary nutrients. (05 Mar 2000) |
| undersensing | Non-sensing of the intracardiac atrial or ventricular depolarisation signal by a pacemaker. (05 Mar 2000) |
| undershapen | Under the usual shape or size; small; dwarfish. "His dwarf, a vicious undershapen thing." (Tennyson) Source: Websters Dictionary (01 Mar 1998) |
| undershirt | A shirt worn next the skin, under another shirt. Synonym: undervest. Source: Websters Dictionary (01 Mar 1998) |
| undershoot | A temporary decrease below the final steady-state value that may occur immediately following the removal of an influence that had been raising that value, i.e., overshoot in a negative direction. (05 Mar 2000) |
| undershot | 1. <zoology> Having the lower incisor teeth projecting beyond the upper ones, as in the bulldog. 2. Moved by water passing beneath; said of a water wheel, and opposed to overshot; as, an undershot wheel. Source: Websters Dictionary (01 Mar 1998) |
| undershrieve | <botany> A low shrub; a woody plant of low stature. Source: Websters Dictionary (01 Mar 1998) |
| 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) |