Gain access to thousands of additional definitions and advanced search features—ad free! JOIN NOW
: an extraordinary appearance (as of light) : meteor
: apparition, phantom
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:
Greek phasmat-, phasma, from phainein to show
Keep scrolling for more
Resources for phasm
Comments on phasm
What made you want to look up phasm? Please tell us where you read or heard it (including the quote, if possible).
the setting in which something occurs
Get Word of the Day daily email!
Musical Words Quiz
Can you spell these 10 commonly misspelled words?
Test Your Knowledge - and learn some interesting things along the way.
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!
That dessert might kill you
How a folk song became a term of derision.
Sorry, not sorry
The participle made famous by Elvis
And is one way more correct than the others?
The story of an imaginary word that managed to sneak past our editors and enter the dictionary.
How to use a word that (literally) drives some people nuts.
The awkward case of 'his or her'
A quiz in common time.
Do you know the person or title these quotes describe?