glot·tal·i·za·tion 
(glŏtl-ĭ-zāshən)
(glŏtl-ĭ-zāshən)n.
The production of a speech sound by narrowing of the glottis or compression of the vocal cords, resulting in creaky voice, ejective pronunciation, or other phonological changes.
glottal·ize′ v.