Definition

Noun: 1. One of two spiral bands of tissue in an egg: A chalaza is one of two twisted, rope-like strands of albumen (egg white) that anchor the yolk to the center of the egg, suspending it within the shell membrane at either end. 2. The basal part of a plant ovule: In botany, the chalaza is the region of an ovule opposite the micropyle, where the integuments (protective layers) and the nucellus (central tissue) are joined together.

Usage Examples

• Zoological context (egg):
  • The chalaza helps keep the yolk centered and protected.
  • When you crack an egg, you can sometimes see the white, twisted cords of the chalaza.
• Botanical context (plant ovule):
  • The chalaza is located at the base of the ovule, opposite the micropylar opening.
  • Nutrients are often transported into the developing seed through the chalaza.

Advanced Usage

• The term is used almost exclusively in specialized biological descriptions. In everyday language regarding eggs, people might refer to it as "the white stringy bit" or simply "the egg anchor."
• The plural form is chalazae (pronounced /kəˈleɪziː/).

Variants and Related Words

• Chalazal (adjective): Relating to or of the nature of a chalaza.
  • Example: The chalazal end of the ovule is where the seed connects to the plant.

Different Meanings

The word has two distinct, domain-specific meanings: 1. Zoological/Agricultural Meaning: The structural anchor within a bird's egg. 2. Botanical Meaning: A specific anatomical region in a plant's ovule (the precursor to a seed).

Synonyms

• For the egg structure: anchor, suspensory ligament (technical).
• For the plant structure: base of the ovule (descriptive). There are no common direct synonyms, as it is a precise anatomical term.

Notes

• This is a highly specialized scientific term. It is not used in general conversation.
• When used, the context (discussing eggs or plant reproduction) makes the intended meaning clear.

Noun

1. one of two spiral bands of tissue connecting the egg yolk to the enclosing membrane at either end of the shell
2. basal part of a plant ovule opposite the micropyle; where integument and nucellus are joined