1. A lady fern with deeply cut leaf segments; found in the Rocky Mountains
   - Athyrium distentifolium

Type of: Athyrium filix-femina, lady fern

• axillary cavity
• axillary fossa
• axillary node
• axillary vein
• axiological
• axiology
• axiom
• axiomatic
• axiomatical
• axiomatically
• axion
• axis
• axis of rotation
• axis vertebra
• axle
• axle bar
• axle grease
• axletree
• Axminster
• axolemma
• axolotl
• axon
• axonal
• axone
• axseed