| 
					o-ring (m)  | 
					
					-o-ring | 
				
				
					| 
					obesita (f)  | 
					
					-obesity | 
				
				
					| 
					obiettivo grandangolare (m)  | 
					
					-wide angle | 
				
				
					| 
					-wide angle objective | 
				
				
					| 
					-wide angle lens | 
				
				
					| 
					obiettivo (m)  | 
					
					-lens | 
				
				
					| 
					oblongata (f)  | 
					
					-spinal bulbe | 
				
				
					| 
					-medulla oblongata | 
				
				
					| 
					oblò grandangolare (m)  | 
					
					-dome port | 
				
				
					| 
					oblò (m)  | 
					
					-porthole | 
				
				
					| 
					oblò (m)  | 
					
					-port | 
				
				
					| 
					occhiali d'immersione | 
					
					-glasses | 
				
				
					| 
					-diving glasses | 
				
				
					| 
					-goggles | 
				
				
					| 
					occhiata (f)  | 
					
					-saddled seabream | 
				
				
					| 
					occhio (m)  | 
					
					-eye | 
				
				
					| 
					Oceano Atlantico (m)  | 
					
					-Atlantic Ocean | 
				
				
					| 
					Oceano Indiano (m)  | 
					
					-Indian Ocean | 
				
				
					| 
					Oceano Pacifico (m)  | 
					
					-Pacific Ocean | 
				
				
					| 
					oceanografia (f)  | 
					
					-oceanography | 
				
				
					| 
					oceanografico  | 
					
					-oceanographic | 
				
				
					| 
					oceano (m)  | 
					
					-ocean | 
				
				
					| 
					ociada (f)  | 
					
					-saddled seabream | 
				
				
					| 
					octopodi | 
					
					-octopoda | 
				
				
					| 
					octopus (m)  | 
					
					-octopus | 
				
				
					| 
					odontoceto (m)  | 
					
					-toothed whale | 
				
				
					| 
					-odontoceti | 
				
				
					| 
					offendere  | 
					
					-break (to) | 
				
				
					| 
					-damage (to) | 
				
				
					| 
					oftalmologo (m)  | 
					
					-ophtalmologist | 
				
				
					| 
					OK  | 
					
					-I'm OK ! | 
				
				
					| 
					-Are you OK ? | 
				
				
					| 
					oliare  | 
					
					-oil (to) | 
				
				
					| 
					olio de silicone (m)  | 
					
					-silicone oil | 
				
				
					| 
					olio (m)  | 
					
					-oil | 
				
				
					| 
					ombelicale (m)  | 
					
					-surface supply diving equipment | 
				
				
					| 
					-hookah | 
				
				
					| 
					-umbilical | 
				
				
					| 
					-surface air supply | 
				
				
					| 
					-SAS | 
				
				
					| 
					-surface supplied diving apparatus | 
				
				
					| 
					-surface supplied breathing apparatus | 
				
				
					| 
					-surface supported air supply apparatus | 
				
				
					| 
					-SSBA | 
				
				
					| 
					-rig | 
				
				
					| 
					ombrella di mare (f)  | 
					
					-spiral tube-worm | 
				
				
					| 
					-peacock fan worm | 
				
				
					| 
					ombrina (f)  | 
					
					-ombrine | 
				
				
					| 
					-umbra | 
				
				
					| 
					-umbrine | 
				
				
					| 
					-corb | 
				
				
					| 
					-croaker | 
				
				
					| 
					omologazione del brevetto  | 
					
					-official certification | 
				
				
					| 
					ondata (f)  | 
					
					-wave | 
				
				
					| 
					onda (f)  | 
					
					-swell | 
				
				
					| 
					onda (f)  | 
					
					-wave | 
				
				
					| 
					ondoso  | 
					
					-stormy | 
				
				
					| 
					operazione (f)  | 
					
					-handling | 
				
				
					| 
					opercolo branchiale (m)  | 
					
					-gill cover | 
				
				
					| 
					-opercle | 
				
				
					| 
					opercolo (m)  | 
					
					-operculum | 
				
				
					| 
					ora di emersione (f)  | 
					
					-surfacing time | 
				
				
					| 
					ora di partenza (f)  | 
					
					-starting time | 
				
				
					| 
					ora di uscita (f)  | 
					
					-surfacing time | 
				
				
					| 
					orata (f)  | 
					
					-gilthead seabream | 
				
				
					| 
					orca (f)  | 
					
					-killer whale | 
				
				
					| 
					orcio (m)  | 
					
					-jar | 
				
				
					| 
					ordormizione (f)  | 
					
					-numbness | 
				
				
					| 
					orecchia di mare (f)  | 
					
					-ear shell | 
				
				
					| 
					-abalone | 
				
				
					| 
					orecchio esterno (m)  | 
					
					-external ear | 
				
				
					| 
					-auricle | 
				
				
					| 
					orecchio interno (m)  | 
					
					-internal ear | 
				
				
					| 
					orecchio medio (m)  | 
					
					-middle ear | 
				
				
					| 
					orecchio (m)  | 
					
					-ear | 
				
				
					| 
					organismo di controllo (m)  | 
					
					-inspection authority | 
				
				
					| 
					organismo (m)  | 
					
					-organism | 
				
				
					| 
					orientamento subacquatico (m)  | 
					
					-underwater orienteering | 
				
				
					| 
					-underwater navigation | 
				
				
					| 
					orientamento (m)  | 
					
					-orientation | 
				
				
					| 
					orina (f)  | 
					
					-urine | 
				
				
					| 
					orizzonte (m)  | 
					
					-horizon | 
				
				
					| 
					ormeggiare  | 
					
					-moor (to) | 
				
				
					| 
					-make fast (to) | 
				
				
					| 
					ormeggiare  | 
					
					-anchor (to) | 
				
				
					| 
					-cast anchor (to) | 
				
				
					| 
					-drop (the) anchor (to) | 
				
				
					| 
					ormeggio (m)  | 
					
					-mooring line | 
				
				
					| 
					-painter | 
				
				
					| 
					orologio per l'immersione (m)  | 
					
					-watch | 
				
				
					| 
					-dive watch | 
				
				
					| 
					orologio (m)  | 
					
					-watch | 
				
				
					| 
					-dive watch | 
				
				
					| 
					ortica di mare (f)  | 
					
					-sea nettle | 
				
				
					| 
					ortica di mare (f)  | 
					
					-hermit crab anemone | 
				
				
					| 
					-parasit anemone | 
				
				
					| 
					oscurita (f)  | 
					
					-darkness | 
				
				
					| 
					ossidazione (f)  | 
					
					-oxidation | 
				
				
					| 
					ossigenazione (f)  | 
					
					-oxygenation | 
				
				
					| 
					ossigeno normobarico (m)  | 
					
					-normobaric oxygen | 
				
				
					| 
					ossigeno puro (m)  | 
					
					-pure oxygen | 
				
				
					| 
					  | 
					
					  | 
				
				
					| 
					ossigenoterapia iperbarica (f)  | 
					
					-hyperbaric oxygenation | 
				
				
					| 
					-HBO | 
				
				
					| 
					ossigenoterapia (f)  | 
					
					-oxygen therapy | 
				
				
					| 
					ossigeno (m)  | 
					
					-oxygen | 
				
				
					| 
					osteonecrosi disbarica (f)  | 
					
					-dysbaric osteonecrosis | 
				
				
					| 
					-dysbaric bone necrosis | 
				
				
					| 
					ostrica (f)  | 
					
					-oyster | 
				
				
					| 
					ostruito  | 
					
					-clogged | 
				
				
					| 
					-stopped | 
				
				
					| 
					-blocked up | 
				
				
					| 
					otarie (f)  | 
					
					-sea lion | 
				
				
					| 
					oticodinia (f)  | 
					
					-Ménière's disease | 
				
				
					| 
					-oticodinia | 
				
				
					| 
					otite (f)  | 
					
					-otitis | 
				
				
					| 
					ottone (m)  | 
					
					-brass | 
				
				
					| 
					otturatore (m)  | 
					
					-shutter | 
				
				
					| 
					overfishing (m)  | 
					
					-overfishing | 
				
				
					| 
					ovest (m)  | 
					
					-west |