first-line
adjective
: being the preferred, standard, or first choice
first-line treatment of tuberculosis
compare second-line
Examples of first-line in a Sentence
surgery is usually not considered a first-line treatment for this type of cancer
Recent Examples on the Web
That’s the equivalent of a low-end first-line rate.
—
Harman Dayal, New York Times, 24 Dec. 2025
The first-line preventive drug for acute mountain sickness, or AMS, is a drug called acetazolamide, sold under the trade name Diamox.
—Alex Hutchinson, Outside, 23 Dec. 2025
However, it's not typically considered a first-line option.
—Heather Jones, Verywell Health, 1 Dec. 2025
The administrator provides first-line leadership to a team of staff working the Quality Assurance, Correspondence and Automatic Call Distribution phone line workloads.
—Sacbee.com, 9 Oct. 2025
See All Example Sentences for first-line
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Harman Dayal, New York Times, 24 Dec. 2025
The first-line preventive drug for acute mountain sickness, or AMS, is a drug called acetazolamide, sold under the trade name Diamox.
—Alex Hutchinson, Outside, 23 Dec. 2025
However, it's not typically considered a first-line option.
—Heather Jones, Verywell Health, 1 Dec. 2025
The administrator provides first-line leadership to a team of staff working the Quality Assurance, Correspondence and Automatic Call Distribution phone line workloads.
—Sacbee.com, 9 Oct. 2025
See All Example Sentences for first-line
Cite this Entry
“First-line.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/first-line. Accessed 31 Dec. 2025.
Copy CitationMedical Definition
first-line
adjective
: being the preferred, standard, or first choice
first-line treatment of advanced breast cancer
compare second-line
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