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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. |
barrier bar·ri·er (bār'ē-ər)
n.
A structure, such as a fence, built to bar passage.
A boundary or limit.
An obstacle or impediment.
Something that separates or holds apart.
Something immaterial that obstructs or impedes behavior.
A physical or biological factor that limits the migration, interbreeding, or free movement of individuals or populations.