drop

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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 periodicals archive ?
The Kuwaiti speaker, meanwhile, praised the efforts of the Ombudsman, Kimberly Prost, to consider dropping names from the unified list.
I felt rather like a fly-on-the-wall and not me as a real person," she explains before dropping names such as Soft Cell, Shakin Stevens and Kirsty MacColl.
Like so many of his characters, Wagner is fond of dropping names, and these pages are filled with celebrities both minor and major (a fictionalised version of the actor Michael Douglas plays a substantial role in the novel), and they jostle for space alongside the author's own creations.
It's not unusual for the 34-year-old to talk to the youths who've been watching him shake off the ring rust - and now they know that he's as good at dropping names as he is at dropping opponents.
Around 40 or 50 of his assistants are now established filmmakers," said Daggubati, dropping names such as Sriram Raghavan and Anurag Kashyap.
As for young upcoming artists, we need more," he added, carefully avoiding dropping names, following the street artists' code of relative 
anonymity.