American Heritage Dictionary
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Century Dictionary
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GNU Webster's 1913
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WordNet
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Elsewhere on the web
The pelvic plastron that had been formatted secondary to appendix perforation was mimicking appendiceal intussusception in the preoperative US and CT images.— BioMed Central - Latest articles
The top part of the shell is the carapace, the underside is the plastron, and the two are connected by the bridge.— We Blog A Lot
He defines it partly by its functions, partly by its connections, as the system of bones which covers and protects the thorax, and gives attachment to certain groups of muscles The most highly developed sternum (according to this definition) is the plastron of the tortoise, whose structure it dominates (p. 103). It is important, therefore, to determine of how many bones the plastron is composed, since the full number of elementary parts of which an organ is composed is best seen when the organ is at the maximum of its development.— Form and Function A Contribution to the History of Animal Morphology
His coat was deeply braided, and his waistcoat was cut low, so that his plastron- scarf hung out from the shirt-bosom, which it would have done well to cover I tell you, Boston's full of 'em," he said excitedly.— The Minister's Charge
In the second course Quiρones encountered the German in the top of his plastron, without piercing it, and the lance came out under his arm-pit, whereupon all thought he was wounded, for on receiving the shock he exclaimed Olas!— Lippincott's Magazine of Popular Literature and Science, Vol. XVI., December, 1880.

American Heritage Dictionary (1)
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