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plural sterna or sternums
(anatomy) The breastbone, consisting of the manubrium, gladiolus, and xiphoid process. quotations examples
The neckline fell into a V, showing the bone of his sternum.
2020, Akwaeke Emezi, The Death of Vivek Oji, Faber & Faber, page 231
(arachnology) The sclerotized ventral plate of spiders, between the coxae, marking the floor of the cephalothorax.