Noun
(French phonology) In the French language, usage of the letter h at the start of a word which does not allow liaison with a preceding consonant or elision of a preceding schwa.
The French word héros ("hero") begins with an aspirated h. Consequently we say le héros /lə e.ʁo/ and les héros /le e.ʁo/, but never /l‿e.ʁo/ and /le‿ze.ʁo/ as we do with the mute h.
Synonym: h aspiré
(linguistics, phonetics, literally) aspiration of a glottal consonant
Source: en.wiktionary.org