A post

noun

: a-pillar

Six-inch-wide blind spot at left edge of windshield, caused by unwiped glass and thick A post.

—Jan P. Norbye et al., Popular Science, June 1971

Word History

First Known Use

1958, in the meaning defined above

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

• More than 250,000 words that aren't in our free dictionary
• Expanded definitions, etymologies, and usage notes
• Advanced search features
• Ad free!