vitamin B

noun

1

: vitamin b complex

2

or vitamin B₁

-ˈbē-ˈwən 

: thiamine

Examples of vitamin B in a Sentence

Recent Examples on the Web

The medication, leucovorin, will be available for children and adults with cerebral folate deficiency, which limits the delivery of folate, a kind of vitamin B, to the brain. —O. Rose Broderick, STAT, 10 Mar. 2026

Some of those include vitamin B, vitamin D, and multivitamins. —Korin Miller, SELF, 6 Mar. 2026

This styling cream is hypercharged with vitamin B to boost elasticity and enhance shine, while brassica oil keeps things smooth and polished. —Reece Andavolgyi, InStyle, 17 Feb. 2026

What are the possible complications of a vitamin B deficiency? —Laura Dorwart, Health, 22 Dec. 2025

Word History

First Known Use

circa 1920, in the meaning defined at sense 1

Rhymes for vitamin B

• abc
• absentee
• addressee
• adoptee
• agouti
• allottee
• amphorae
• amputee
• apc
• apogee
• appointee
• assessee

Kids Definition

vitamin B

noun

1

: vitamin b complex

2

: thiamine

Medical Definition

vitamin B

noun

1

: vitamin b complex

2

: any of numerous members of the vitamin B complex

especially : thiamine