Secrete
Secrete , transitive verb
[Latin secretus separated, secret, hidden, past participle of secernere. See Secret, and compare Discrete, Discreet.]
1.
To deposit in a place of hiding; to hide; to conceal; as, to secrete stolen goods; to secrete one's self.
2.
(Physiology) To separate from the blood and elaborate by the process of secretion; to elaborate and emit as a secretion. See Secretion.
Why one set of cells should secrete bile, another urea, and so on, we do not know.