isosceles
/aɪˈsɑsəliz/adjective
isosceles is spelled I-S-O-S-C-E-L-E-S: 9 letters and 4 syllables. It appears about once in every 6 million words in written English, the 74,122nd most frequent word form (wordfreq, 2021 data). As an adjective, isosceles means “Having (at least) two sides of equal length, used especially of a triangle or trapezoid” (English Wiktionary, September 2026).
How many letters and syllables are in isosceles?
| Letters | 9: I-S-O-S-C-E-L-E-S |
|---|---|
| Syllables | 4 (from its American pronunciation) |
| In writing | about once in every 6 million words; the 74,122nd most frequent word form |
| Wrong spellings searched | none measured in search |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation and the CMU Pronouncing Dictionary; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How common is isosceles?
Isosceles appears about once in every 6 million words in written English, the 74,122nd most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How do you pronounce isosceles?
- UK /aɪˈsɒsəliːz/
- US /aɪˈsɑsəliz/
Isosceles has 4 syllables (counted from its American pronunciation in the CMU Pronouncing Dictionary).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: LL-Q1860_(eng)-Vealhurl-isosceles.wav, Wikimedia Commons (author and licence on each file's page).
What does isosceles mean?
The meanings the English Wiktionary records, quoted as written there (source below).
adjective
- 1
Having (at least) two sides of equal length, used especially of a triangle or trapezoid.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Isosceles in Spanish, French, German and Portuguese
In the sense having two sides of equal length, used especially of an isosceles triangle or tr:
| Language | Words |
|---|---|
| French | isocèle |
| German | gleichschenklig |
| Portuguese | isósceles, isóscele |
| Spanish | isósceles |
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.
Where does isosceles come from?
Borrowed from Latin īsoscelēs, from Ancient Greek ἰσοσκελής (isoskelḗs, “equal-legged”), from ἴσος (ísos, “equal”) + σκέλος (skélos, “leg”) + -ής (-ḗs, adjective suffix). See also iso-.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).