arboriculture/ʹahbərikulchə/ noun

• op. cit.
• ope
• OPEC
• open
• open air
• open-air
• open-and-shut
• opencast
• open/cease fire
• open chain
• open circuit
• open-circuit television
• open court
• open day
• open door
• open-ended
• opener
• open-faced
• openhanded
• openhearted
• open-hearth
• open-hearth process
• open-heart surgery
• open house
• opening