1. Yellow-green fern of rocky areas of northern hemisphere
   - northern oak fern, Gymnocarpium robertianum

Derived forms: limestone ferns

Type of: fern

• armoured sea robin
• armoured vehicle
• armourer
• armoury
• armpit
• armrest
• arms
• arms control
• arms deal
• arms industry
• arms manufacturer
• arms race
• arms-runner
• Armstrong
• army
• army ant
• army attaché
• army base
• army brat
• army corps
• army cutworm
• army engineer
• Army for the Liberation of Rwanda
• Army High Performance Computing Research Center
• army hut