What does "h-prothesis" mean?

The prothesis of the sound /h/ to words beginning with a vowel, especially as found in Celtic languages such as Irish and Welsh, and in dialects of English, especially those that pronounce h weakly.

H-prothesis

noun

noun ·Rare ·Advanced level

Definitions

Noun

1
The prothesis of the sound /h/ to words beginning with a vowel, especially as found in Celtic languages such as Irish and Welsh, and in dialects of English, especially those that pronounce h weakly. uncountable

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