What's the "een" in Halloween?
ectogenous ec·tog·e·nous (ěk-tŏj'ə-nəs) or ec·to·gen·ic (ěk'tə-jěn'ĭk)adj.
Having the ability to live and develop outside a host, as certain pathogenic microorganisms.
Able to live and develop outside a host, as certain pathogenic bacteria.
Originating or produced from outside an organism, tissue, or cell; exogenous.