Of or relating to a dartos (a layer of muscle in the skin); having properties similar to or derived from the dartos muscle.
From 'dartos' (Greek medical term for this muscle layer) plus '-ic' (suffix creating adjectives meaning 'of or relating to').
The dartos muscle is why your scrotum wrinkles in cold water—it's an automatic reflex that protects sperm by keeping them at the right temperature!
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