nature reserve

Preventing, hindering, or acting as an obstacle to. / Carried out to deter military aggression. / Slowing the development of an illness; prophylactic. / (obsolete) Going before; preceding.

(transitive) To keep someone from proceeding by holding them back or making claims on their attention. / (transitive) To put under custody. / (transitive) To keep back or from; to withhold.

Initialism of multiple chemical sensitivity.