Mycology. the horizontal portion of a mushroom, bearing gills, tubes, etc., on its underside; a cap.
the umbrella or bell of a jellyfish.
Also called cap cloud, scarf cloud. Meteorology. a small, thin cloud just above or attached to a growing cumulus cloud.
a felt skullcap worn by the ancient Romans and Greeks.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use pileus in a sentence
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.
British Dictionary definitions for pileus
the upper cap-shaped part of a mushroom or similar spore-producing body
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for pileus
The umbrellalike fruiting structure forming the top of a fleshy fungus. It is supported by the stipe. The cap of a mushroom is a pileus.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.