tomentum

/toʊˈmɛntəm/
noun
  1. A layer of soft, fine hairs on the surface of a plant leaf or stem.
    • Botanists use a magnifying glass to examine the tomentum on the underside of the leaf.
    • The tomentum on the lamb's ear plant gives it a soft, fuzzy texture.
    • Some desert plants have a thick tomentum that helps reduce water loss.
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