the.com/plastron
the turtle's built-in breastplate, proof armor was a fashion statement first.
means The flat underside of a turtle's or tortoise's shell, the belly-plate that joins the domed carapace above; the word also covers a few human echoes — the padded chest-guard worn in fencing, a stiff shirt-front, and certain ornamental breast-coverings.
from From French 'plastron,' a breastplate, borrowed in turn from Italian 'piastrone,' an augmentative of 'piastra,' a thin plate of metal. Trace 'piastra' further back and you reach Latin 'emplastrum' — a plaster or dressing laid flat on the body — itself from Greek 'emplastron.' So the turtle's armored belly shares deep roots with the humble bandage: both are things pressed flat against flesh. The fencing and shirt-front senses came later, naming whatever sat plate-like upon the chest.
- bony origin
- Evolved from ancient belly ribs and collarbones
- hinge models
- Box turtles slam theirs shut like a vault
- fencing too
- Names the padded chest guard fencers wear
- sex tell
- Concave plastrons help males mount rounded females
- ancient roots
- 260-million-year-old turtles already sported one
hawksbill sea turtle plastron — ventral shell of endangered marine reptile, 13 scute plates, harvested historically for tortoiseshell
fencing plastron — protective chest garment in épée and foil, worn under jacket since 19th century olympic fencing
box turtle plastron — hinged ventral shell allowing closure, found across north america, enables survival defense