Found in the following dictionaries
OTCWL2014 (NASPA Word List 2014)
"Ceftriaxone" Definition
noun
A semisynthetic analogue of cephalosporin, C18H16N8Na2O7S3, that is administered parenterally and has a broad spectrum of antibiotic activity.
Source: American Heritage Dictionary
A broad-spectrum semisynthetic cephalosporin antibiotic CHNOS administered parenterally in the form of its sodium salt.
Source: Merriam-Webster
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