| underlay | <chemical> To incline from the vertical; to hade; said of a vein, fault, or lode. 1. <chemical> The inclination of a vein, fault, or lode from the vertical; a hade; called also underlie. 2. A thickness of paper, pasteboard, or the like, placed under a cut, or stereotype plate, or under type, in the from, to bring it, or any part of it, to the proper height; also, something placed back of a part of the tympan, so as to secure the right impression. Source: Websters Dictionary (01 Mar 1998) |
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| underlayer | 1. One who, or that which, underlays or is underlaid; a lower layer. 2. <chemical> A perpendicular shaft sunk to cut the lode at any required depth. Source: Websters Dictionary (01 Mar 1998) |
| underlocker | <chemical> A person who inspects a mine daily. Synonym: underviewer. Source: Websters Dictionary (01 Mar 1998) |
| 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) |