| eel | (noun) voracious snakelike marine or freshwater fishes with smooth slimy usually scaleless skin and having a continuous vertical fin but no ventral fins | - |
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| (noun) the fatty flesh of eel; an elongate fish found in fresh water in Europe and America; large eels are usually smoked or pickled | - |
| eelblenny | (noun) eellike fishes found in subarctic coastal waters | - |
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| eelgrass | (noun) submerged marine plant with very long narrow leaves found in abundance along North Atlantic coasts | Synonyms: grass wrack, sea wrack, Zostera marina |
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| (noun) submerged aquatic plant with ribbonlike leaves; Old World and Australia | Synonyms: tape grass, Vallisneria spiralis, wild celery |
| eelpout | (noun) marine eellike mostly bottom-dwelling fishes of northern seas | Synonyms: pout |
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| (noun) elongate freshwater cod of northern Europe and Asia and North America having barbels around its mouth | Synonyms: burbot, cusk, ling, Lota lota |
| eelworm | (noun) any of various small free-living plant-parasitic roundworms | - |
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