annulus
[ an-yuh-luhs ]
/ ˈæn yə ləs /
noun, plural an·nu·li [an-yuh-lahy], /ˈæn yəˌlaɪ/, an·nu·lus·es.
a ring; a ringlike part, band, or space.
Geometry. the space between two concentric circles on a plane.
the veil remnant on a mushroom stalk.
a growth ring, as on the cross section of a tree trunk, that can be used to estimate age.
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Origin of annulus
Words nearby annulus
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
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British Dictionary definitions for annulus
annulus
/ (ˈænjʊləs) /
noun plural -li (-ˌlaɪ) or -luses
the area between two concentric circles
a ring-shaped part, figure, or space
Word Origin for annulus
C16: from Latin, variant of ānulus ring
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
Medical definitions for annulus
annulus
n. pl. an•nu•lus•es
A circular or ring-shaped structure.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Scientific definitions for annulus
annulus
[ ăn′yə-ləs ]
Plural annuluses annuli (ăn′yə-lī′)
A ringlike figure, part, structure, or marking, such as a growth ring on the scale of a fish.
A ring or group of specialized cells around the sporangia of many ferns. By changing shape in response to variations in humidity, it breaks open the sporangium and then releases the spores with a whipping motion.
The ringlike remains of a membrane (called a veil), found around the stipes of certain basidiomycete mushrooms. The presence or absence of an annulus is often used to identify the species of an individual mushroom.
The figure bounded by and containing the area between two concentric circles.
The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.