hyperviscosity
noun
hy·per·vis·cos·i·ty
| \ ˌhī-pər-vi-ˈskä-sə-tē
\
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Definition of hyperviscosity
: excessive viscosity or thickness
especially
: an abnormal increase in the viscosity of blood
The patient had no symptoms suggestive of hyperviscosity, including visual changes, vertigo, ataxia, and changes in mental status. — Alexander Turchin et al.