Noun
A Mexican shrub, Lippia graveolens, not closely related to true oregano, but with leaves that smell and taste like like it.
A Mexican shrub, Poliomintha longiflora, with leaves that smell and taste like oregano
A Mexican and southwestern-US herb related to bee balm, Mt. Pima oregano, Monarda austromontana, which smells and tastes like oregano
Source: en.wiktionary.org