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yaw

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yaw

1[yaw] ,
–verb (used without object)
1. to deviate temporarily from a straight course, as a ship.
2. (of an aircraft) to have a motion about its vertical axis.
3. (of a rocket or guided missile) to deviate from a stable flight attitude by oscillation of the longitudinal axis in the horizontal plane.
–verb (used with object)
4. to cause to yaw.
–noun
5. a movement of deviation from a direct course, as of a ship.
6. a motion of an aircraft about its vertical axis.
7. an angle, to the right or left, determined by the direction of motion of an aircraft or spacecraft and its vertical and longitudinal plane of symmetry.
8. (of a rocket or guided missile)
a. the act of yawing.
b. the angular displacement of the longitudinal axis due to yawing.

Origin:
1540–50; orig. uncert.

yaw

2[yaw] ,
–noun Pathology.
one of the lesions of yaws.

Origin:
1735–45; back formation from yaws
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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yaw   (yô)   
v.   yawed, yaw·ing, yaws

v.   intr.
  1. Nautical To swerve off course momentarily or temporarily: The ship yawed as the heavy wave struck abeam.

  2. To turn about the vertical axis. Used of an aircraft, spacecraft, or projectile.

  3. To move unsteadily; weave.

v.   tr.
To cause to yaw.
n.  
  1. The act of yawing.

  2. Extent of yawing, measured in degrees.


[Perhaps of Scandinavian origin.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

yaw 
"to fall away from the line of a course," 1546, from O.N. jaga, O.Dan. jæge "to drive, chase," from M.L.G. jagen (see yacht).
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: yaw
Pronunciation: 'yo
Function: noun
: one of the lesions characteristic of yaws —see MOTHER YAW
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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