... Examples-a-aerarely -ataalga – algae, larva – larvaestoma – stomata -ex -icesindex – indices (or indexes*) apex – apices (or apexes*)-ies -iesspecies, series, facies-is -esaxis – axes, ... plural forms (e.g. woman – women, foot – feet, tooth – teeth, mouse – mice, leaf – leaves, life – lives, tomato – tomatoes) or have no plural form (e.g. equipment, information, news). For more ... hypothesis – hypotheses-ix -icesappendix – appendices (or appendixes*) matrix – matrices (or matrixes*)-on -aphenomenon – phenomenacriterion – criteria-um -adatum – data, bacterium – bacteria-us-irarely...