Definition: Obsolete term for a substance of microbial origin postulated to inhibit the resistance mechanisms of the host.
[L. agressor, an assailant, fr. ad-gredio, pp. -gressus, to attack]
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.