Synthesize vs Auxotrophic - What's the difference?

As a verb synthesize

is to combine two or more things to produce a new, more complex product.

(biology) describing a strain of organism that requires a specific metabolic substance that the parent organism was able to synthesize by itself.

* synthesise (UK)

(synthesiz)

To combine two or more things to produce a new, more complex product.

(of two or more things) To be combined producing a new, more complex product.

(chemistry) To produce a substance by chemical synthesis.

(intransitive, chemistry, of a substance) To be produced by chemical synthesis.

* photosynthesize

(en adjective)

(biology) Describing a strain of organism that requires a specific metabolic substance that the parent organism was able to synthesize by itself