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

Lucky for me, its unique combination of marshmallow root extract, hyaluronic acid, and vitamin B leaves my hair feeling soft and shiny without any greasy residue. —Catharine Malzahn, Glamour, 18 Mar. 2026

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

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