How does Czech form syllables without vowels?

In Czech the consonants r and l can be syllabic, meaning they carry a syllable on their own. The word vlk (wolf) has one syllable whose nucleus is the l, and krk (neck) has one syllable centred on the r.

How is the count calculated?

Each vowel (a, e, i, o, u, y and their accented forms, plus ou/au/eu diphthongs) counts as one nucleus. An r or l counts as a syllable only when it has no adjacent vowel to lean on, which marks it as syllabic.

Does the tongue-twister strč prst skrz krk really have no vowels?

Correct. 'Strč prst skrz krk' (stick a finger through the neck) contains no written vowels, yet has four syllables, each built on a syllabic r.

Are diphthongs counted as one or two syllables?

The native Czech diphthongs ou, au, and eu count as a single syllable. Other adjacent vowels in loanwords are generally counted separately.

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Czech Syllable Counter

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Czech is unusual among European languages because the consonants r and l can act as the centre of a syllable, with no vowel present. This Czech syllable counter detects both ordinary vowel nuclei and these syllabic consonants, so it correctly counts words like vlk, krk, and the vowel-free tongue-twister strč prst skrz krk.

How it works

The counter scans each word and marks every syllable nucleus. A nucleus is:

a vowel: a e i o u y and the accented forms á é í ó ú ů ý;
a Czech diphthong ou, au, or eu, counted as one;
a syllabic r or l — an r or l that has no adjacent vowel in the same syllable to attach to.

The number of nuclei equals the number of syllables. So vlk has one nucleus (the syllabic l) and nesl has one (the e, while the final l leans on it). The phrase strč prst skrz krk yields four syllables, one syllabic r per word.

Example

mlha (fog) breaks into ml-ha: the first l is syllabic and the a is a vowel, giving two syllables. prst (finger) is a single syllable built on the syllabic r.

Notes

The rule is a close approximation of standard Czech phonology and handles the everyday cases reliably. A few rare or foreign words may carry secondary stress patterns that differ, so treat unusual loanwords as estimates.