The polymer is irregular, aperiodic -there's no single component which simply repeats.

Modeling and experimental results of an ultrasonic aperiodic flat lens for use in air are presented.

Blood sampling caused short aperiodic spikes in the proportion of reticulocytes which appear to have a different developmental pathway than normal reticulocytes.

The ancient Orithenans suspected, but didn't know how to prove, that the tiles of the Teglon were aperiodic: that no pattern would ever repeat.