a. 外生的

[医] 外原的, 外生的

[ adj ]
derived or originating externally
<adj.all>

exogenous \ex*og"e*nous\, a.
1. (Bot.) derived from or originating outside; pertaining to,
or having the character of, an exogen; -- the opposite of
{endogenous}.

Syn: exogenetic.

2. (Bot.) Growing by addition to the exterior; growing by
addition of a new external layer of cells on the surface
just beneath the bark; -- of plants.

3. (Anat.) Growing from previously ossified parts; -- opposed
to {autogenous}. --Owen.

4. (Med.) caused by factors from outside the body, rather
than from an abnormality of internal functions; -- of
illness.
[PJC]

5. (Biol., Biochem.) not synthesized within the organism;
absorbed or assimilated from outside the organism.
[PJC]

{Exogenous aneurism} (Med.), an aneurism which is produced by
causes acting from without, as from injury.
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