indumentum

/ˌɪndʊˈmɛntəm/
noun
  1. A covering of hairs, scales, or other soft material on a plant or animal.
    • The fuzzy indumentum on the lamb's ear plant makes it soft to the touch.
    • Botanists use the indumentum of a leaf to help identify different species of oak.
    • The caterpillar's indumentum of fine hairs protects it from predators.
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