1. Small genus sometimes included in genus Onoclea; in some classifications both genera are placed in Polypodiaceae
   - Matteuccia, Pteretis, genus Pteretis

Type of: fern genus

Part of: Athyriaceae, Dryopteridaceae, family Athyriaceae, family Dryopteridaceae

• atactic
• atactic abasia
• Atakapa
• Atakapan
• ataman
• atar
• ataractic
• ataractic agent
• ataractic drug
• Atarax
• ataraxia
• ataraxic
• ataraxis
• ataraxy
• Ataturk
• atavism
• atavist
• atavistic
• ataxia
• ataxic
• ataxic abasia
• ataxic aphasia
• ataxy
• Atayalic
• Ate