aPTT |
<abbreviation> Activated partial thromboplastin time. (05 Mar 2000) |
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aptychus |
<zoology> A shelly plate found in the terminal chambers of ammonite shells. Some authors consider them to be jaws; others, opercula. Origin: NL, fr. Gr. Priv. +, fold. Source: Websters Dictionary (01 Mar 1998) |