Glottal
/ˈɡlɑːtl/
Definition 1 of 2
Pro Tip 1/3Speaking Nuance
Glottal sounds can give emphasis or emotion to speech in various languages. 
She put a glottal emphasis on the word 'no' to show her strong refusal.
Pro Tip 2/3Voice Care
Frequent glottal sounds may strain your throat, use them carefully when speaking. 
After making repeated glottal stops in her speech, she sipped some water.
Pro Tip 3/3Regional Variations
Certain accents, like Cockney English, often feature glottal sounds more prominently. 
In his Cockney accent, 'bottle' was pronounced with a glottal stop instead of the 'tt' sound.