1
: a silver-white soft waxy ductile element of the alkali metal group with atomic number 11 that occurs abundantly in nature in combined form and is very active chemically see Chemical Elements Table
2
: salt sense 1a, sodium chloride
—not used technically
reduced her sodium intake
a low-sodium diet
Examples of sodium in a Sentence
Recent Examples on the Web
Scientists are working on sodium-ion batteries that solve several problems with lithium-ion batteries currently used in devices, including cost, and the nature of lithium mining.
—
John Werner, Forbes.com, 25 Jan. 2026
An international research team has identified electrochemical presodiation as the superior strategy for stabilizing a new generation of low-cost sodium-ion batteries (SIBs) derived from lavender flower waste.
—Aman Tripathi, Interesting Engineering, 24 Jan. 2026
Speaking of the formula, it’s enhanced with a variety of electrolytes, including sodium, potassium, magnesium, zinc, and copper—think of it like your favorite sports drink, but for your face.
—Alicia Geigel, Southern Living, 23 Jan. 2026
Initiatives include things like reducing sodium in the food supply (given excess salt in food is a driver of hypertension), and expanding health care initiatives focused on diabetes prevention, obesity treatment, and financial incentives to achieve cardiovascular risk factor reduction.
—Allison Aubrey, NPR, 22 Jan. 2026
See All Example Sentences for sodium
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John Werner, Forbes.com, 25 Jan. 2026
An international research team has identified electrochemical presodiation as the superior strategy for stabilizing a new generation of low-cost sodium-ion batteries (SIBs) derived from lavender flower waste.
—Aman Tripathi, Interesting Engineering, 24 Jan. 2026
Speaking of the formula, it’s enhanced with a variety of electrolytes, including sodium, potassium, magnesium, zinc, and copper—think of it like your favorite sports drink, but for your face.
—Alicia Geigel, Southern Living, 23 Jan. 2026
Initiatives include things like reducing sodium in the food supply (given excess salt in food is a driver of hypertension), and expanding health care initiatives focused on diabetes prevention, obesity treatment, and financial incentives to achieve cardiovascular risk factor reduction.
—Allison Aubrey, NPR, 22 Jan. 2026
See All Example Sentences for sodium
Cite this Entry
“Sodium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sodium. Accessed 31 Jan. 2026.
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Medical Definition
sodium
noun
so·di·um
ˈsōd-ē-əm 
: a silver white soft waxy ductile element of the alkali metal group that occurs abundantly in nature in combined form and is very active chemically
—symbol Na
see Chemical Elements Table
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