from The American Heritage® Dictionary of the English Language, 4th Edition
- 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 atmospheric conditions exist.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The hypothesis that microorganisms may transmit life from outer space to habitable bodies; or the process of such transmission.
from the GNU version of the Collaborative International Dictionary of English
- n. The doctrine of the widespread distribution of germs, from which under favorable circumstances bacteria, vibrios, etc., may develop.
- n. The doctrine that all organisms must come from living parents; biogenesis; -- the opposite of
- n. The theory that life on earth originated from spores or germs that evolved elsewhere in the uiniverse; -- in contradistinction to the theory that life evolved on earth from inanimate matter. This theory, originally suggested by S. Arrhenius in 1907, is sometimes advanced by those who feel that the time required for evolution of life is too long for life to have evolved on Earth from inanimate matter.
from The Century Dictionary and Cyclopedia
- n. Same as panspermatism.
Greek panspermiā, mixture of all seeds : pan-, pan- + sperma, seed; see sperm1.(American Heritage® Dictionary of the English Language, Fourth Edition)