Noun

(en noun)

(organic chemistry) A homologous series of organic molecules whose functional group is an oxygen atom joined to a carbon atom—by a double bond—in a carbon-hydrogen based molecule.

* acetone R₁ = R₂ = CH₃

* methyl ethyl ketone R₁ = CH₃, R₂ = C₂H₅

* camphor C??H??O

Noun

(en noun)

(neologism) Any website that allows users to upload content, particularly itself.

* {{quote-book, 2007, title=Academic librarianship by design, author=Steven J. Bell, John D. Shank

, passage=None of this is to suggest that academic libraries should turn their websites into a YouTube or Facebook in which our user communities would create all the content,

* {{quote-book, 2008, title=Web 2.0 Heroes, author=Bradley L. Jones

, passage=There is all kinds of stuff that people post there- some of it is entertaining, some is actually useful as a template for studying or for business...it is sort of like a YouTube for documents.}}

(neologism) A small video that can be viewed online, particularly one hosted on .

* {{quote-book, 2007, IPhone Fully Loaded, author=Andy Ihnatko

, passage=Then it's a YouTube of some kid trying to play "Radar Love" on a cheap guitar using only his feet,

* {{quote-journal, 2009, title=Bring me the Horizon, journal=Revolver, date=March, author=Valerie McQueen

, passage=Not too long ago, there was a YouTube of you two brawling. How did the musical collaboration happen?}}