Pileus (noun) Definition, Meaning & Examples

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noun, plural pi·le·i [pahy-lee-ahy, pil-ee-ahy] /ˈpaɪ liˌaɪ, ˈpɪl iˌaɪ/ for 1, 2, 4, pi·le·us for 3.
  1. the horizontal portion of a mushroom, bearing gills, tubes, etc., on its underside; a cap.
  2. Zoology.
    • the umbrella or bell of a jellyfish.
    • pileum.
  3. a small, thin cloud just above or attached to a growing cumulus cloud.
  4. a felt skullcap worn by the ancient Romans and Greeks.
noun plural -lei (-lɪˌaɪ)
  1. the upper cap-shaped part of a mushroom or similar spore-producing body
Plural pilei (pī′lē-ī′)
    Pileus (noun) Definition, Meaning & Examples

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