form-drag

form drag

noun Physics.
the portion of the resisting force encountered by a body moving through a fluid that is due to the irregularity of shape of the body, reducible to a minimum by streamlining.

Origin:
1930–35

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
form drag
 
n
the drag on a body moving through a fluid as a result of the shape of the body. It can be reduced by streamlining

Collins English Dictionary - Complete & Unabridged 10th Edition
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