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ju·ve·nile 'jü-və-.nīl, -vən-əl adj
1) physiologically immature or undeveloped <\juvenile fish>
2) of, relating to, characteristic of, or affecting children or young people <\juvenile arthritis>
3) reflecting psychological or intellectual immaturity <\juvenile behavior>
juvenile n
1) a young person esp one below the legally established age (as of 18) of adulthood
2) a young individual resembling an adult of its kind except in size and reproductive activity
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ju·ve·nile (jooґvə-nīl) 1. pertaining to youth or childhood; young or immature. 2. a youth or child; a young animal. 3. a cell or organism intermediate between the immature form and the mature form.Medical dictionary. 2011.