We don't have synonyms for endothelin yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are endothelia, endothelium and endothelial.
(n) :
(biochemistry) Any of several polypeptides consisting of 21 amino acid residues that are produced in various cells and tissues, that play a role in regulating vasomotor activity, cell proliferation, and the production of hormones, and that have been implicated in the development of vascular disease.
(n) :
(biochemistry) Any of several polypeptides consisting of 21 amino acid residues that are produced in various cells and tissues, that play a role in regulating vasomotor activity, cell proliferation, and the production of hormones, and that have been implicated in the development of vascular disease.