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trabeated
trabecula
trace (1)
trace (2)
trace element
trace fossil
tracer
tracer bullet
tracer element
tracery
trachea
tracheid
tracheitis
tracheo-
tracheobronchial
tracheoesophageal
tracheole
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tracer element
trac·er el·e·ment (plural trac·er el·e·men·ts)


noun 
Definition:
 
radioactive isotope: a radioactive element used in experiments so that its movements can be monitored
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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