1. Plural of chiasma; the point where two structures cross or intersect, especially the crossing of the optic nerves in the brain.
Usage: anatomy; biology
2. In genetics, the point where homologous chromosomes exchange genetic material during meiosis.
Usage: genetics; biology

Examples

• The optic chiasmas are located at the base of the brain where the optic nerves cross.
• Damage to the chiasmas can result in vision problems affecting both eyes.
• During meiosis, chiasmas form between paired chromosomes, allowing genetic recombination.
• The formation of chiasmas is essential for genetic diversity in offspring.
• Medical imaging can reveal abnormalities in the chiasmas that may affect visual function.