A shortened or informal form of geode; a small, hollow rock formation with crystal formations inside.
From geode (Greek geōides, 'earth-like'), shortened in casual scientific or mineralogical speech. The abbreviation emerged from mineralogy field practice.
Geod is practically slang in the rock-hunting community—you might hear a geologist say 'found a nice geod' on a dig, the same way biologists shorten 'specimen' to 'spec.'
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