booster seat
noun
: a portable seat that is placed on or attached to a chair or an automobile seat in order to raise a child to a higher position
… they should use a booster seat until they are 8 years old or at least 4 feet, 9 inches tall. Only after that can they ride in the front seat, and even then the back is always safer.—Denise Milosevich
She's too big for a high chair, but needs to sit on her knees to keep her head fully above the dining room table. And she doesn't want a booster seat. She'll boost herself, thank you very much.—Dave Manley
called also booster chair
Cite this Entry
“Booster seat.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/booster%20seat. Accessed 2 Sep. 2026.
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