from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. the posterior, or fourth lateral plate in the plastron of a turtle
from the GNU version of the Collaborative International Dictionary of English
- n. The posterior, or fourth, lateral plate in the plastron of turtles; -- called also xiphisternum.
from The Century Dictionary and Cyclopedia
- n. The fourth lateral piece of the plastron of a turtle; one of the pair of terminal pieces of the plastron in Chelonia, called xiphisternum by some. See cuts under plastron and Chelonia.
Ancient Greek ξίφος (xiphos, "sword") + plastron (Wiktionary)