noun Biology.
the theory that life exists and is distributed throughout the universe in the form of germs or spores that develop in the right environment.
Also, panspermatism [pan-spur-muh-tiz-uhm] , panspermy [pan-spur-mee] .

1835–45; < Neo-Latin < Greek panspermía mixture of all seeds. See pan-, -sperm, -ia

panspermic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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