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extra- or extro-

pref.

Outside; beyond: extraterritorial.

[Latin extrā-, from extrā; see eghs in the Appendix of Indo-European roots.]

ex·tra

(ĕkstrə)

adj.

1. More than or beyond what is usual, normal, expected, or necessary: earned extra money by freelancing. See Synonyms at superfluous.

2. Subject to an additional charge: Coffee does not come with dinner but is extra.

1. Something more than is usual or necessary: bought too much paint and gave the extra to a friend.

2. Something, such as an accessory on a motor vehicle, for which an additional charge is made.

3. A special edition of a newspaper.

4. A performer hired to play a minor part, as in a crowd scene in a film.

adv.

To an exceptional extent or degree; unusually: extra dry.

[Probably short for EXTRAORDINARY.]

Indo-European & Semitic Roots Appendices

Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:

Indo-European Roots

Semitic Roots

The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.

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