1. In an artificial environment outside the living organism
   - in vitro

1. In an artificial environment outside the living organism
   - in vitro

Encyclopedia: Ex vivo

• opal
• opal glass
• opalesce
• opalescence
• opalescent
• opaline
• opalise
• opalize
• opaque
• opaque gem
• opaquely
• opaqueness
• OPCW
• ope
• OPEC
• Opel
• open
• open access
• open account
• open chain
• open circuit
• open cluster
• open day
• open door
• open fire