noun
One who or that which expands.
(dentistry) A device used to widen the upper jaw so that the bottom and upper teeth will fit together better; a palatal expander.
(graphical user interface) A control that expands to show more options or commands, keeping them hidden until needed.
(graph theory) A kind of sparse graph with strong connectivity properties.
Mac + Safari
iPhone + iPad
Google Chrome
Mozilla Firefox
Opera
Microsoft Edge