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A false parasite; may be either a commensal or a temporary parasite (the latter is an organism accidentally ingested and surviving briefly in the intestine).
pseudoparasite(soo?do-par'a-sit) [? + ? + sitos, food]
1. Anything resembling a parasite.
2. An organism that can live as a parasite, although it is normally not one. See: parasite, facultative