Longman Dictionary of Contemporary English homepage

Topic: BIOLOGY

Date: 1600-1700
Language: French
Origin: sécrétion, from Latin secretio 'separation', from secretus; SECRET1

secretion

noun
     
se‧cre‧tion
a) [uncountable and countable]HB a substance, usually liquid, produced by part of a plant or animal:
These secretions are used by the caterpillar as a defence.
b) [uncountable]HB the production of this substance:
the secretion of hormones by the pituitary gland
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