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| Glossary Term starting with O |
| Search SeaLifeBase |
| Oarfishes |
| Object Oriented |
| Objective synonym |
| Obligate lecithotrophic live bearer |
| Obligate mutualism |
| Obligatory |
| Observer |
| Obsolescent |
| Obsolete |
| Obtuse |
| Occam's razor |
| Occidental College, California |
| Occipital |
| Occipital centrum |
| Occipital region |
| Occiput |
| Occlusal |
| Occlusible |
| Ocean ecosystems |
| Oceania |
| Oceanic |
| Oceanic benthic ecosystems |
| Oceanic seamount |
| Oceanodromous |
| Oceanographic survey |
| Oceanography |
| Ocellate |
| Ocellus |
| Octopus |
| Ocular |
| Odd-year run |
| Oedema |
| Oesophagus |
| Off-site |
| Offal |
| Offshore |
| Offshore fishery |
| Offshore plain |
| Offshore waters |
| Ohio State University Museum of Zoology |
| Oil globule |
| Oily fish |
| Okinawa Regional Research Center |
| Oklahoma Museum of Natural History |
| Oklahoma State University at Stillwater |
| Old Dominion University, Virginia |
| Oldwife |
| Olfactory |
| Olfactory bulb |
| Olfactory organ |
| Olfactory pit |
| Oligo- |
| Oligocene |
| Oligochaeta |
| Oligohaline |
| Oligomictic |
| Oligophagous |
| Oligosaline |
| Oligothermic |
| Oligotrophic |
| Olim |
| Oman moray |
| Oman Natural History Museum, Muscat |
| Omega-3-fatty acid |
| Omni- |
| Omnivore |
| On-line database |
| On-site |
| Ongrowing |
| Onomatography |
| Onshore waters |
| Ontogenesis |
| Ontogenetic characters |
| Ontogeny |
| Oo |
| Oocyte |
| Oogonia |
| Oophagy |
| Ooze |
| Opahs |
| Open access fishery |
| Open access resource |
| Operating system |
| Opercle |
| Opercular |
| Opercular canal |
| Opercular opening |
| Opercular pumping |
| Operculum |
| Opistho- |
| Opisthocoelous |
| Opisthonephros |
| Opisthonephrus |
| Opisthure |
| Opportunistic feeding |
| Opportunity cost |
| Optic cup |
| Optic nerve foramen |
| Optic pedicel |
| Optic primordium |
| Optic tectum |
| Optic vesicles |
| Optical Character Recognition |
| Optimum age |
| Optimum length |
| Optimum yield |
| Oral |
| Oral brooder |
| Oral cavity |
| Oral disc |
| Oral disk |
| Oral fimbriae |
| Oral gestation |
| Oral incubation |
| Oral plate |
| Oral valve |
| Orange meat |
| Orbicular |
| Orbicular stage |
| Orbicular velvetfishes |
| Orbit |
| Orbital |
| Orbital bones |
| Orbital diameter |
| Orbital region |
| Ordivician |
| Oreos |
| Oreosoma |
| Organic |
| Organism |
| Organogenesis |
| Organoleptic |
| Oriental |
| Oriental cure |
| Origin |
| Original description |
| Original designation |
| Original publication |
| Orobranchial chamber |
| Oronasal curtain |
| Oronasal groove |
| Ortho- |
| Orthographic variants |
| Orthography |
| Osmoregulation |
| Osseus |
| Ossicle |
| Ossification |
| Ossify |
| Ostariophysan |
| Ostariophysi |
| Osteichthyes |
| Osteocranium |
| Osteoderm |
| Osteology |
| Ostraciform |
| Ostracin |
| Ostracitoxin |
| Ostracods |
| Otic |
| Otic capsule |
| Otic region |
| Otic vesicle |
| Otocyst |
| Otolith |
| Otter |
| Otter board |
| Otter trawl |
| Ouananiche |
| Outgroup |
| Outlier male |
| Output controls |
| Ova |
| Oval |
| Ovarian tunic |
| Ovary |
| Ovas secas |
| Ovate |
| Over stock |
| Over-feeding |
| Overfished |
| Overfishing |
| Overlapping dentition |
| Overturn |
| Oviduct |
| Oviparity |
| Oviparous |
| Oviphagous |
| Oviposit |
| Ovipositor |
| Ovo-testes |
| Ovoid |
| Ovophile |
| Ovoviviparity |
| Ovoviviparous |
| Ovum |
| Oxbow |
| Oxbow lake |
| Oxycercal |
| Oxygen consumption |
| Oxyluciferin |
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