pyridoxal
noun
pyr·i·dox·al
ˌpir-ə-ˈdäk-ˌsal 
: a crystalline aldehyde C8H9NO3 of the vitamin B6 group that occurs as a phosphate and is active as a coenzyme
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Vitamin B6 may appear on nutrition labels as pyridoxine, pyridoxal or pyridoxamine, referring to its different chemical forms.
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Lindsey Leake, NBC news, 29 Jan. 2026
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Lindsey Leake, NBC news, 29 Jan. 2026
Cite this Entry
“Pyridoxal.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/pyridoxal. Accessed 15 Feb. 2026.
Copy CitationMedical Definition
pyridoxal
noun
pyr·i·dox·al
ˌpir-ə-ˈdäk-ˌsal
: a crystalline aldehyde C8H9NO3 of the vitamin B6 group that in the form of its phosphate is active as a coenzyme
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