hashtag

SayHASH-tag/ˈhæʃˌtæɡ/

3 meanings of hashtag

1
nouncountable
A word or phrase with a # sign in front, used to label posts online.
Like a sticker that says what something is about.
He put a hashtag at the end of his photo.
Funny hashtags often make a post go viral.
Similartag
2
verbtransitive or intransitive
To add a # tag to a message so people can find it by topic.
Like writing a topic word on a folder so you can find it later.
Remember to hashtag your post if you want strangers to find it.
She hashtagged every photo from the concert.
Similartag
3
nouncolloquialmetonymicallycountable
The # symbol, especially when used in front of a word online.
Like the little symbol you see on a phone keypad.
Press the hashtag after entering your code.
She drew a small hashtag next to the date in her notes.
Similarhash, pound

Practice

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Origin

It comes from 'hash' (the # sign) plus 'tag'. Chris Messina suggested using # to group posts on Twitter, and the term was first written as 'hash tag' in 2007.