What is "polymerise"

Usage examples of "polymerise".

My back and hips felt strong as tempered Damascene steel, resilient as the most polymerised of plastics, and I swung inward and upward, in­ward and upward, inward and upward, moving with easy confident strokes, lifting her as though on jewelled ratchets to ever-higher levels of sensation and not incidentally bringing myself up there, too.

I hit the commands I'd found in those clever polymerised cat's brains, and all the robots froze suddenly in mid motion.