noun, plural pi·le·i [pahy-lee-ahy, pil-ee-ahy] /ˈpaɪ liˌaɪ, ˈpɪl iˌaɪ/ for 1, 2, 4, pi·le·us for 3.
- the umbrella or bell of a jellyfish.
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Origin of pileus
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Example sentences from the Web for pileus
Pileus: At first globular, its edge connected to stem by the veil; then round convex, at length becoming possibly almost flat.
Pileus: Expansion two to four inches; color varying from pale bright pink to deep scarlet; very smooth.
Average diameter of extended pileus of each of these species about three and one-half inches; veil absent in each.
Pileus: Firm, solid; greenish or pinkish-gray; at first convex, with flat top, ultimately rising from centre to rim.
Pileus: In shape like above, varying in color from bright red to dull, subdued purplish, with a distinct bloom.