RhymeZone: obstruent definitions

Definitions of obstruent:

adjective: Causing obstruction; blocking up.
noun: (phonetics) A consonant sound formed by obstructing the airway, causing turbulence; a plosive, fricative, or affricate.
noun: (medicine) Anything that obstructs, especially in the passages of the body.

(Definitions from Wiktionary)