1. Partly or entirely open to the sky
   - hypaethral

See also: unenclosed

• acaroid resin
• acarophobia
• acarpellous
• acarpelous
• acarpous
• acarus
• acaryote
• ACAS
• acatalectic
• acataphasia
• acathexia
• acathexis
• acaudal
• acaudate
• acaulescent
• ACC
• accaroid resin
• accede
• accelerando
• accelerate
• accelerated
• acceleration
• acceleration unit
• accelerative
• accelerator