Definition

1. Adjective:
   • Relating to or characterized by an allantois: Pertaining to the allantois, a membranous sac that develops in the embryos of reptiles, birds, and mammals, involved in respiration and excretion.

Usage Examples

• Adjective:
  • The allantoic membrane is crucial for gas exchange in avian embryos.
  • Researchers studied the allantoic fluid for metabolic byproducts.

Advanced Usage

• "allantoic cavity": The fluid-filled space inside the allantois.
  • Nutrients diffuse through the wall of the allantoic cavity.
• "allantoic circulation": The system of blood vessels associated with the allantois.
  • The allantoic circulation connects the embryo to the chorion.

Variants and Related Words

• Allantois (noun): The extraembryonic membrane itself.
  • The allantois stores waste products in a bird's egg.
• Allantoid (adjective): Shaped like a sausage; sometimes used as a synonym for allantoic.
  • The allantoid structure was visible under the microscope.

Synonyms

• Chorioallantoic: Specifically relating to both the chorion and the allantois, often used together in biological contexts.
  • The chorioallantoic membrane is a common model in virology.

Notes on Meaning

This is a highly specialized biological term. Its use is almost exclusively confined to embryology and descriptive zoology. It does not have common phrasal verbs or idioms associated with it.

Adjective

1. relating to or characterized by an allantois