Webster's English Dictionary

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secretion

se.cre.tion \si-'kre--sh*n\ \-sh*-.ner-e-\ n [F se`cre`tion, fr. L 
   secretion-, secretio separation, fr.] [2secrete]secretus, pp. of secernere 
   to separate - more at SECRET 1a: the process of segregating, elaborating, 
   and releasing some material ei ther functionally specialized (as saliva) or 
   isolated for excretion (as urine) 1b: a product of such secretion formed by 
   an animal or plant; esp :  one performing a specific useful function in the 
   organism 2: the act of hiding something : CONCEALMENT  - se.cre.tion.ary aj