commensal
C1CEFR level
80/100Rarity: very rare
TechnicalRegister
A microorganism that colonises a host without normally causing harm.
Coagulase-negative staphylococci are skin commensals, so their growth in a blood culture often signals contamination.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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