plasma thromboplastin antecedent

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Medical Dictionary

plasma thromboplastin antecedent n.
Abbr. PTA
See factor XI.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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WordNet

plasma thromboplastin antecedent
noun
coagulation factor whose deficiency results in a hemorrhagic tendency

WordNet® 3.0, © 2006 by Princeton University.
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a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.

a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.

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