| the offspring of a zebra and a donkey. |
| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
centrum cen·trum (sěn'trəm)
n. pl. cen·trums or cen·tra (-trə)
A center of any kind, especially an anatomical center.
The major part of a vertebra, exclusive of the bases of the neural arch.