from The American Heritage® Dictionary of the English Language, 4th Edition
- abbr. executive order
from Wiktionary, Creative Commons Attribution/Share-Alike License
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from The Century Dictionary and Cyclopedia
- n. In petrography, specifically, a prefix used before the names of rocks, chiefly volcanic, to indicate that they were erupted in geologically ancient time as distinguished from Tertiary or recent time.
Sorry, no etymologies found.