noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   One who or that which expands.
2. 2
   an electronic device that increases the dynamic range of the audio signal. wordnet
3. 3
   A device used to widen the upper jaw so that the bottom and upper teeth will fit together better; a palatal expander.
4. 4
   A control that expands to show more options or commands, keeping them hidden until needed.
5. 5
   A kind of sparse graph with strong connectivity properties.

Synonyms

All synonyms

disclosure widget

Etymology

From expand + -er.

Related phrases

chest expanderpalatal expanderpalate expanderplasma expandervolume expander

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.