\Ob"stru*ent\, a. [L. obstruens, p. pr. of obstruere.
See {Obstruct}.]
Causing obstruction; blocking up; hindering; as, an obstruent
medicine. --Johnson.

\Ob"stru*ent\, n.
Anything that obstructs or closes a passage; esp., that which
obstructs natural passages in the body; as, a medicine which
acts as an obstruent.