- Zoology. one of the two albuminous twisted cords which fasten an egg yolk to the shell membrane.
- Botany. the point of an ovule or seed where the integuments are united to the nucellus.
Origin of chalaza
1695–1705; < New Latin < Greek: hail, lump
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for chalaza
Seeds larger than Aestivalis, pear-shaped; chalaza roundish.The Grapes of New York
U. P. Hedrick
Orthotropous ovule of Buckwheat: c, hilum and chalaza; f, orifice.
Campylotropous ovule of a Chickweed: c, hilum and chalaza; f, orifice.
Chalaza, the place where the coats and the kernel of the ovule blend.
The chalaza is at the insertion or base, the foramen or orifice is at the apex.
- one of a pair of spiral threads of albumen holding the yolk of a bird's egg in position
- the basal part of a plant ovule, where the integuments and nucellus are joined
C18: New Latin, from Greek: hailstone
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
- One of two spiral bands of tissue in an egg that connect the yolk to the lining membrane at either end of the shell.
- The region of a plant ovule that is opposite the micropyle, where the integuments and nucellus are joined.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.