| Word | Definitions | Synonyms |
|---|---|---|
| anoxia | (noun) severe hypoxia; absence of oxygen in inspired gases or in arterial blood or in the tissues | - |
| hypoxia | (noun) oxygen deficiency causing a very strong drive to correct the deficiency | - |
| pyrrhuloxia | (noun) crested grey-and-red bird of southwest United States and Mexico | Synonyms: Pyrrhuloxia sinuata |