power car

noun

1

a

: a railroad car equipped with machinery for supplying heat and electricity to a train

b

: a railroad car having controls for operation alone or with other cars as a train

2

: a usually faired in structure supported from or suspended beneath the hull of an airship and carrying the engine or engines used for propulsion

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!