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A polyamide is a polymer (of course!) that has amide groups in the backbone chain.
Here are two ways of looking at an amide group:
Remember what our little baby protein looked like? Every time we added an amino acid, we made an amide group! See the amide groups in blue?
Now, we said that a protein is a polyamide. Any old polyamide would look like this, and the R groups don't have to look like the middle of an amino acid. The middle "CHR" could just be a chain of six -CH2- units, or it could get more complicated.
Want to learn more about polyamides and nylons? Click here!