1. Of or relating to or involving the stomach and oesophagus

See also: esophagus [N. Amer], stomach

• order mantophasmatodea
• order Marattiales
• order Marchantiales
• order Marsupialia
• order Mecoptera
• order Moniliales
• order Monotremata
• order Mucorales
• order Musales
• order Myaceae
• order Mycelia Sterilia
• order Mycoplasmatales
• order Mycrosporidia
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• order Neuroptera
• order Nidulariales
• order Notostraca
• order Nudibranchia