1. Plural of presternum; the anterior or ventral portion of the sternum or breastbone in vertebrates.
Usage: anatomy; technical; plural form

Examples

• The presterna of the bird skeleton are fused to form a single rigid structure.
• In comparative anatomy, the presterna vary significantly among different species of reptiles.
• The surgeon examined the presterna during the thoracic examination.
• Fossil records show how presterna evolved across different vertebrate lineages.