Home › Words › M › mesoaperturemesoaperturemesoaperture · noun — A specific structural feature within the complex wall layers of certain types of pollen grains.Definition from Wiktionary (CC BY-SA 3.0).EtymologyFrom meso- + aperture.nounA specific structural feature within the complex wall layers of certain types of pollen grains.Definitions & examples from Wiktionary (CC BY-SA 3.0).