Home › Words › M › membarmembarmembar · noun — A memory barrier (an instruction that enforces an ordering constraint on memory operations issued before and after it).Definition from Wiktionary (CC BY-SA 3.0).EtymologyAbbreviation of memory barrier.nounA memory barrier (an instruction that enforces an ordering constraint on memory operations issued before and after it).Definitions & examples from Wiktionary (CC BY-SA 3.0).