hypoxia

https://doi.org/10.1351/goldbook.10834
  1. Abnormally low dioxygen content or tension.
  2. Deficiency of dioxygen in the inspired air, in blood, or in tissues, short of anoxia.
Source:
PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 767 (https://doi.org/10.1515/pac-2015-1202)