| exothermic | Describes a chemical reaction that releases energy (usually in the form of heat). (09 Oct 1997) |
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| exotic | Not native to a given area, either intentionally transplanted from another region or introduced accidentally. (09 Oct 1997) |
| exotic species | Plant or animal species introduced into an area where they do not occur naturally, non-native species. (09 Oct 1997) |
| exotoxic | 1. Relating to an exotoxin. 2. Relating to the introduction of an exogenous poison or toxin. (05 Mar 2000) |
| exotoxin | <protein> Toxin released from gram-positive and gram-negative bacteria as opposed to endotoxins that form part of the cell wall. Examples are cholera, pertussis and diphtheria toxins. Usually specific and highly toxic. (18 Nov 1997) |
| exotoxins | Toxins produced, especially by bacterial or fungal cells, and released into the culture medium or environment. (12 Dec 1998) |
| exotropia | <clinical sign> The outward or temporal deviation of an eye. (27 Sep 1997) |