suction stop: a stop consonant made by the suction of air into the mouth (as in Bantu)
stop consonant: a consonant produced by stopping the flow of air at some point and suddenly releasing it
dark matter: (cosmology) a hypothetical form of matter that is believed to make up 90 percent of the universe; it is invisible (does not absorb or emit light) and does not collide with atomic particles but exerts gravitational force