[pol-ee-am-ahyd, -id]
noun Chemistry.
a polymer in which the monomer units are linked together by the amide group –CONH–.

1925–30; poly- + amide

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World English Dictionary
polyamide (ˌpɒlɪˈæmaɪd, -mɪd)
See also nylon any one of a class of synthetic polymeric materials containing recurring -CONH- groups

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American Heritage
Science Dictionary
polyamide   (pŏl'ē-ām'īd')  Pronunciation Key 
A polymer produced by the reaction of the amino group (NH2) from one molecule with the carboxylic acid group (CO2H) from another molecule. The resulting structure is similar to that of a protein. Silk is a naturally occurring polyamide, and nylon is a synthetic polyamide.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Desalination is done today with polyamide membranes that get clogged with oil and organisms in seawater.
They have an outer poly-urethane liner and an inner polyamide body.
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