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Definition of second–line
: not being the usual or preferred choice second–line drugs to treat tuberculosis — compare first-line
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First Known Use of second–line
1969
Medical Dictionary
second–line
play
adjective
sec·ond–line
\ˌsek-ən(d)-ˌlīn\
Medical Definition of second–line
: being or using a drug that is not the usual or preferred choice—compare first-line
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