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

• autotelic
• autotelism
• autotomic
• autotomise
• autotomize
• autotomy
• autotroph
• autotrophic
• autotrophic organism
• autotropism
• autotype
• autotypic
• autotypy
• autumn
• autumn crocus
• autumn pumpkin
• autumn sneezeweed
• autumn-blooming
• autumn-flowering
• autumnal
• autumnal equinox
• autunite
• Auvergne
• auxesis
• auxetic