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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

physical entity go
an entity that has physical existence

causal agent, cause, causal agency go
any entity that produces an effect or is responsible for events or results

agent go
an active and efficient cause

vasoconstrictor, vasoconstrictive, pressor go
any agent that causes a narrowing of an opening of a blood vessel: cold or stress or nicotine or epinephrine or norepinephrine or angiotensin or vasopressin or certain drugs

vasopressin, antidiuretic hormone, ADH, Pitressin
hormone secreted by the posterior pituitary gland (trade name Pitressin) and also by nerve endings in the hypothalamus

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