1. Possessing a symmetrical tail that extends beyond the end of the vertebral column (as in most bony fishes)

Antonym: heterocercal

• 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
• auxiliary
• auxiliary airfield
• auxiliary boiler
• auxiliary cell
• auxiliary engine