panspermia

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pan·sper·mi·a

, panspermatism (pan-sper'mē-ă, -sper'mă-tizm),
The hypothetical doctrine of the omnipresence of minute forms and spores of animal and vegetable life, thus accounting for apparent spontaneous generation.
[pan- + G. sperma, seed]
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panspermia

(păn-spûr′mē-ə)
n.
The theory that microorganisms or biochemical compounds from outer space are responsible for originating life on Earth and possibly in other parts of the universe where suitable environmental conditions exist.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.