NCIt definition : Any organism that has a close, symbiotic relationship with a separate, host organism.;
Alternative definition : NCI-GLOSS: An animal or plant that gets nutrients by living on or in an organism of
another species. A complete parasite gets all of its nutrients from the host organism,
but a semi-parasite gets only some of its nutrients from the host.; NICHD: An organism that lives on or in a host organism, and that draws its nourishment
from that host.;
Codes from synonyms : CDR0000044310; CDR0000044075;