n. The formation of a blood clot in a vein independently from the presence of inflammation of the vein.
The Century Dictionary and Cyclopedia
n. Thrombosis in a vein.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. thrombosis of a vein without prior inflammation of the vein; associated with sluggish blood flow (as in prolonged bedrest or pregnancy or surgery) or with rapid coagulation of the blood