virion
C1CEFR level
70/100Rarity: rare
TechnicalRegister
A complete, infective virus particle outside a host cell.
Each mature virion is released by budding, acquiring an envelope from the host cell membrane.
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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