shear

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shear

 [shēr]
an applied force that tends to cause an opposite but parallel sliding motion of the planes of an object. Such motions cause tissues and blood vessels to move in such a way that blood flow may be interrupted, placing the patient at risk for pressure ulcers. An example of a shearing force is seen when a patient slumps in a chair; the skin around the buttocks is stretched by the movement and interferes with circulation.

shear

(shēr),
The distortion of a body by two oppositely directed parallel forces. The distortion consists of a sliding over one another of imaginary planes (within the body) parallel to the planes of the forces.
[A.S.]

shear

(shîr)
v. sheared, sheared or shorn (shôrn), shearing, shears
v.tr.
1. To remove (fleece or hair) by cutting or clipping.
2. To remove the hair or fleece from.
v.intr.
To use a cutting tool such as shears.
n.
1. often shears
a. A pair of scissors.
b. Any of various implements or machines that cut with a scissorlike action.
2. The act, process, or result of shearing, especially when used to indicate a sheep's age: a two-shear ram.
3. Something cut off by shearing.

shear′er n.

shear

[shir]
Etymology: AS, scearan, to cut
an applied force or pressure exerted against the surface and layers of the skin as tissues slide in opposite but parallel planes.
enlarge picture
Torn aorta caused by shearing force

shear

imposed load, delivering equal (in magnitude) and opposite (in direction) parallel forces, that tends to displace the object along a plane parallel to and between lines of force, causing adjacent structures to slide past one another; tissues are subjected to shear load during movement

shear,

n any force that causes slippage between a pair of contiguous articulated parts in a direction that parallels the plane in which they contact.
shear, inferior innominate,
n a condition in which the movement of the hipbone is restricted in upward and unrestricted in downward directions because the posterior and anterior superior iliac spines (PSIS and ASIS, respectively) are positioned below the contralateral points.
shear, inferior pubic,
n a condition in which one pubic bone is displaced below its normal mate.
shear, posterior pubic,
n a condition in which one pubic bone is displaced rearward of its normal mate.
shear, sacral,
n complex nonphysiologic translational sacral motion relative to the hipbones.
shear, superior innominate,
n a condition in which the movement of the hipbone is unrestricted in upward and restricted in downward directions because the posterior and anterior superior iliac spines (PSIS and ASIS, respectively) are positioned above the contralateral points.
shear, superior pubic,
n a condition in which one pubic bone is displaced above its normal mate.
shear, symphyseal (sim·f·sēlˑ shērˑ),
n condition in which the two halves of the symphysis slide over one other in a direction parallel to the plane in which they contact.

shear

(shēr)
Distortion of a body by two oppositely directed parallel forces; consists of a sliding over one another of imaginary planes (within body) parallel to planes of forces.
[A.S.]

shear,

shear

1. to remove the fleece of a sheep.
2. pressure on a mass in such a way that planes within it are pressured to move in a direction parallel to the pressure. Any movement is proportional to the distance from the plane at which movement occurs.

shear injury
injury to tissues caused by shear pressure. See shearing injuries (2).
shear stress
the stress to which a tissue is subjected by a shear force without injury actually occurring.
References in classic literature ?
As his eyes grew accustomed to the darkness, he saw more distinctly than ever the sheer fall, the tops of the bending trees below.
99 in the mass channel, where sheers are a growth category, said Gary Kitchens, business manager for freestanding window treatments in national accounts at Springs Industries.
And sheers remain a strong category as a new crop of technically interesting and simply beautiful fabrics were introduced here.
EFORE novelist, playwright and poet Owen Sheers was unveiled as the WRU's first writer-in-residence this week a rather less celebrated scribe was sourcing inspiration from recent rugby events.
NEW YORK -- Sheers once again proved to be the big story at the Home Textiles Market here.
Cheryl Johnson, manager of decorative pillows and windows at Croscill Home Fashions, said the mark apparel fabrics have made on the home textiles industry, particularly on sheers, has been positive and has helped contribute to the category's tremendous popularity.
Last week glamorous literary figures Owen Sheers and Francesca Rhydderch met at Aberystwyth Arts Centre to preview the new film Resistance, based on Sheers' novel imagining 1944 Britain under Nazi occupation, and starring Michael Sheen.
NEW YORK -- Retailers can't get their fill of printed sheers and silks.
OWEN Sheers is introducing me to the town he's currently calling "home".