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Keeping some features that are associated with its youthful state, even while the animal itself has reached its mature state. This term is often used to describe the ability of some animals to reach sexual maturity while still larvae.

It also applies to our modern obsession with hairlessness, big eyes, and youthful clothing.
One might think that girls in school uniforms would be a turn off, but they have a certain neotonous appeal.

by Whirr April 09, 2008
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