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| the offspring of a zebra and a donkey. |
| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
agent a·gent (ā'jənt)
n.
A force or substance, such as a chemical, that causes a change.
| agent (ā'jənt) Pronunciation Key
A substance that can bring about a chemical reaction or a biological effect. Compare reagent. |