Standard Lemma guide

expander

noun · 4 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • Southern-England: Recorded audio is listed in the source snapshot.

1

noun

Meaning 1

One who or that which expands.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

A device used to widen the upper jaw so that the bottom and upper teeth will fit together better; a palatal expander.

Definition source: English Wiktionary via Wiktextract

Topics: dentistry, medicine, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

A control that expands to show more options or commands, keeping them hidden until needed.

Definition source: English Wiktionary via Wiktextract

Topics: computing, engineering, graphical-user-interface, mathematics, natural-sciences, physical-sciences, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: disclosure widget

Antonyms: none provided

4

noun

Meaning 4

A kind of sparse graph with strong connectivity properties.

Definition source: English Wiktionary via Wiktextract

Topics: graph-theory, mathematics, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

Etymology tree English expand Proto-Indo-European *-yósder. Proto-Italic *-āzios Latin -āriusnom. Latin -āriusbor. Proto-Germanic *-ārijaz Proto-West Germanic *-ārī Old English -ere Middle English -ere English -er English expander From expand + -er.

Across languages

Translations

2 source translations are retained for this English entry.

  • Spanish: expánder — Translations
  • Spanish: expansor — Translations
Real reading context

expander in complete knowledge articles