hypotension

https://doi.org/10.1351/goldbook.11825
  1. Subnormal arterial blood pressure.
    Note: Hypotension can be a cause of dizziness, weakness and fainting.
  2. Lower than normal pressure or tension of any kind (used less commonly).
Source:
PAC, 2015, 87, 841. (IUPAC Glossary of terms used in neurotoxicology (IUPAC Recommendations 2015)) on page 874 [Terms] [Paper]