heterochronia het·er·o·chro·ni·a (hět'ə-rō-krō'nē-ə)
n.
The origin or development of tissues or organs at an unusual time or out of the regular sequence.
| the offspring of a zebra and a donkey. |
| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |
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