Home › Words › H › hypocingulumhypocingulumhypocingulum · noun — the cingulum or the hypovalve of a diatom.Definition from Wiktionary (CC BY-SA 3.0).EtymologyFrom hypo- + cingulum.nounThe cingulum or the hypovalve of a diatomDefinitions & examples from Wiktionary (CC BY-SA 3.0).