0 relating to or produced by the glottis (= an opening in the throat that is closed when you swallow or make particular sounds):
Glottal aperture may affect pitch, interacting in complex ways with airflow.
In speech, narrowing is used to change resonance in sounds that already have constriction at the glottal and epiglottal levels.
However, alternations show that in some cases these glottal stops are epenthetic.
I know of no analyses in the literature that assume that glottal stop is ever the product of spreading.
The uvular fricatives are realised as postvelar or velar fricatives, and the uvular /q/ is pronounced as a glottal stop.
We have just seen that glottal constriction creates strong feature-economy effects.
