Skip to Content




  1. Prefix used in the SI and metric systems to signify submultiples of 10-21.
  2. Prefix used in the metric system and SI to signify one sextillionth (10-21).

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.