1. Dark and dismal as of the rivers Acheron and Styx in Hades
   "in the depths of an Acheronian forest"
   - Acherontic, Stygian

See also: Acheron, dark

• mote
• motel
• motel room
• motet
• moth
• moth bean
• moth miller
• moth mullein
• moth orchid
• moth plant
• moth-eaten
• moth-resistant
• mothball
• mother
• mother board
• Mother Carey's chicken
• Mother Carey's hen
• mother cell
• mother country
• mother figure
• Mother Goose
• mother hen
• Mother Hubbard
• Mother Jones
• mother lode