Definition of chalaza in English:

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chalaza

Pronunciation: /kəˈlāzə/ Pronunciation: /-ˈlazə/

noun (plural chalazae /-ˈlāzē/ /-ˈlazē/ /-ˌzī/)

Zoology
(In a bird’s egg) each of two twisted membranous strips joining the yolk to the ends of the shell.
Example sentences
  • In wheat, evidence was found that a barrier occurred in the chalaza, a small zone of cells between the maternal vascular tissue and the nucellus.
  • In sections of caryopses, greenish yellow fluorescence was observed in the cell walls of the chalaza and the outer layers of the nucellar projection.
  • The chalaza in a duck egg is not as noticeable as it is in a chicken egg and the white is more transparent with less yellow coloring.

Derivatives

chalazal

adjective
Example sentences
  • Note the chalazal vascular bundle that encircles about three-quarters of the seed and the two short side branches that contain phloem only.
  • In addition, a strong staining was observed in maternal chalazal tissue shortly after fertilization, and persisted throughout seed development.
  • No changes in the staining of chalazal cell walls were detected at the end of grain filling.

Origin

Early 18th century: modern Latin, from Greek khalaza 'small knot'.

For editors and proofreaders

Syllabification: cha·la·za

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