drop

(redirected from dropped off)
Also found in: Dictionary, Thesaurus, Medical, Legal, Financial.
Related to dropped off: look to, shy away from, in view of

drop

1. a steep or sheer incline or slope
2. Military the act of unloading troops, equipment, or supplies by parachute
3. Theatre See drop curtain
4. Nautical the midships height of a sail bent to a fixed yard
5. Austral Cricket slang a fall of the wicket
6. See drop shot
7. Rugby short for drop kick, drop-kick See also drop off dropout

Drop

Any one of the guttae attached to the underside of the mutules or triglyphs of a Doric entablature.

Drop

 

a small volume of liquid that is bounded in a state of equilibrium by a surface of rotation.

Drops form when a liquid flows slowly out of a small opening or runs off the edge of a surface, as well as when a liquid is atomized or emulsified. Drops also form when vapors condense on solid nonwettable surfaces and on condensation nuclei (ions, dust particles) in gaseous media; water droplets in the atmosphere arise in this way in the formation of dew, fog, and clouds.

The form of a drop is determined by the effect of surface tension (tending to decrease the surface of the drop) and external forces (above all, gravity). Microscopic drops for which gravity is not a decisive factor, and drops under the conditions of weightlessness have the form of a sphere, which is a body with minimum surface for a given volume. Large drops under earth conditions take a spherical form only when the densities of the drop and of the surrounding medium are equal. Falling raindrops, affected by gravity, the pressure of the opposing air current, and surface tension, assume the shape of a bun (broader across than vertically). Drops assume the shape of a flattened sphere on nonwettable surfaces, and they spread out on wettable surfaces.

The form and size of drops breaking away from the end of a capillary tube (pipette) depend on the diameter of the tube, the surface tension o~, and the density of the liquid. This relationship forms the basis for the determination of the surface tension of liquids from the weight of the drops leaving a vertical cylindrical tube (stalagmometer) and from the shape of the drops suspended from the end of a tube or resting on a flat surface.

IU. N. DROZHZHIN

drop

[dräp]
(fluid mechanics)
The quantity of liquid that coalesces into a single globule; sizes vary according to physical conditions and the properties of the fluid itself.
(hydrology)
The difference in water-surface elevations that is measured up-and downstream from a narrowing in the stream.
(metallurgy)
A casting defect due to the falling of a portion of sand from an overhanging section of the mold.
(mineralogy)
A funnel-shaped downward intrusion of sedimentary rock into the roof of a coal seam.
(plant pathology)
A fungus disease of various vegetables caused by Sclerotinia sclerotiorum and characterized by wilt and stem rot.

drop

1. Any one of the guttae under the mutules or triglyphs of a Doric entablature.
2. In a cabinet lock, the vertical dimension from the finished edge of the lock to the center of the cylinder or tube.
3. In air conditioning, the vertical distance that a horizontally projected airstream falls from its original elevation when leaving an outlet, measured at the end of the throw.
4. Same as drop curtain.
5. Same as drop panel.
6. Of a stair, a fitting used to close the bottom end of a tubular newel.
7. Same as pendant, 2; also see corner drop.
8. Same as turned drop.
References in classic literature ?
Their branches were encumbered with snow, and it silently dropped off in wet heaps while I stood at the window.
Some who were leaning their backs against the wall had dropped off to sleep where they stood, because there was no room to lie down; others lay stretched out on the floor--it was a mass of men packed together so closely for the sake of warmth, that I looked about in vain for a nook to lie down in.
Had there been any particular reason why we should not have gone to sleep again, but have got up and dressed then and there, we should have dropped off while we were looking at our watches, and have slept till ten.
A tree afforded him the safety, seclusion and comforts of a well-appointed bedchamber, and to the chorus of the hunters and the hunted of the wild river bank he soon dropped off into deep slumber.
In my desperation, I pushed past them, and was about to enter the churchyard gate, when a group of ragged urchins, that had been hanging like bees to the window, suddenly dropped off and made a rush for the porch, vociferating in the uncouth dialect of their country something which signified, 'It's over - they're coming out
But Brissenden, breathing painfully, had dropped off to sleep, his chin buried in a scarf and resting on his sunken chest, his body wrapped in the long overcoat and shaking to the vibration of the propellers.
The matrons dropped off one by one, with the exception of six or eight particular friends, who had determined to stop all night; the lights in the houses gradually disappeared; the last bulletin was issued that Mrs Kenwigs was as well as could be expected; and the whole family were left to their repose.
For some time he followed closely a party of some ten or twelve roisterers; but from this number one by one dropped off, until three only remained together, in a narrow and gloomy lane little frequented.
He listened, but, as he heard no more, he set it down as the challenge of the guard upon the walls, and dropped off to sleep once more.