Standard Lemma guide

cardioid

adj · 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.

  • US: Recorded audio is listed in the source snapshot.

1

adj

Meaning 1

Having this characteristic shape

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

adj

Meaning 2

sensitive in front, but not behind or at the sides

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

An epicycloid with exactly one cusp; the plane curve with polar equation ρ=1+ cos ,θ - approximately heart-shaped

Definition source: English Wiktionary via Wiktextract

Topics: geometry, mathematics, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

noun

Meaning 4

an epicycloid in which the rolling circle equals the fixed circle

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: epicycloid

History

Etymology

By surface analysis, cardi- + -oid.

Across languages

Translations

11 source translations are retained for this English entry.

  • Czech: kardioida — epicycloid with one cusp
  • Danish: kardioide — epicycloid with one cusp
  • Esperanto: kardioido — epicycloid with one cusp
  • Finnish: kardioidi — epicycloid with one cusp
  • French: cardioïde — epicycloid with one cusp
  • German: Kardioide — epicycloid with one cusp
  • German: Herzkurve — epicycloid with one cusp
  • Italian: cardioide — epicycloid with one cusp
  • Korean: 하트방정식 (hateubangjeongsik) — epicycloid with one cusp
  • Polish: kardioida — epicycloid with one cusp
  • Russian: кардиоида (kardioida) — epicycloid with one cusp