| trough | 1. A long, hollow vessel, generally for holding water or other liquid, especially one formed by excavating a log longitudinally on one side; a long tray; also, a wooden channel for conveying water, as to a mill wheel. 2. Any channel, receptacle, or depression, of a long and narrow shape; as, trough between two ridges, etc. Trough gutter, a rectangular or V-shaped gutter, usually hung below the eaves of a house. Trough of the sea, the depression between two waves. Origin: OE. Trough, trogh, AS. Trog, troh; akin to D, G, & Icel. Trog, Sw. Trag, Dan. Trug; probably originally meaning, made of wood, and akin to E. Tree. & 241. See Tree, and cf. Trug. Source: Websters Dictionary (01 Mar 1998) |
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| trough-shell | <zoology> Any bivalve shell of the genus Mactra. See Mactra. Source: Websters Dictionary (01 Mar 1998) |
| Langmuir trough | <apparatus> A device for studying the properties of lipid monolayers at an air/water interface. A moveable barrier connected to a balance allows measurement of surface pressure. (18 Nov 1997) |
| systolic/diastolic ratio | A calculation from pulsed Doppler ultrasound determinations of blood flow velocities that reflects intrinsic resistance in an arterial blood vessel. (05 Mar 2000) |
| diastolic | Of or pertaining to the diastole. (18 Nov 1997) |
| diastolic afterpotential | In the heart, a transmembrane potential change following repolarization, which may reach threshold magnitude and cause a rhythm disturbance; often recorded in poisoning, as by digitalis overdosage. (05 Mar 2000) |
| diastolic blood pressure | The pressure exerted on the walls of the arteries when the heart is in the relaxation phase (diastole). Considered abnormally elevated if consistently over 90 mmhg. (27 Sep 1997) |
| diastolic murmur | A murmur heard during diastole. (05 Mar 2000) |
| diastolic pressure | The intracardiac pressure during or resulting from diastolic relaxation of a cardiac chamber; the lowest arterial blood pressure reached during any given ventricular cycle. (05 Mar 2000) |
| diastolic shock | The abnormally palpable impact, appreciated by a hand on the chest wall, of an accentuated third heart sound. (05 Mar 2000) |
| diastolic thrill | A thrill felt over the precordium or over a blood vessel during ventricular diastole. (05 Mar 2000) |
| early diastolic murmur | A murmur that begins with the second heart sound, as the murmur of aortic insufficiency. (05 Mar 2000) |
| total end-diastolic diameter | Cross sectional diameter of the left ventricle including the septum and posterior wall thicknesses in diastole. (05 Mar 2000) |
| end-diastolic | 1. Occurring at the end of diastole, immediately before the next systole, as in end-diastolic pressure. 2. Interrupting the final moments of diastole, barely premature, as in end-diastolic extrasystole. (05 Mar 2000) |
| end-diastolic volume | The amount of blood in the ventricle immediately before a cardiac contraction begins; a measurement of cardiac filling between beats, related to diastolic function. (05 Mar 2000) |