Serratia
noun
Ser·ra·tia
| \ se-ˈrā-sh(ē-)ə
\
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Medical Definition of Serratia
: a genus of aerobic saprophytic flagellated rod-shaped bacteria of the family Enterobacteriaceae that occur as rods, commonly produce a bright red pigment, and include one (S. marcescens) associated with some human opportunistic infections