| alderfly | (noun) dark-colored insect having predaceous aquatic larvae | Synonyms: alder fly, Sialis lutaria |
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| butterfly | (noun) a swimming stroke in which the arms are thrown forward together out of the water while the feet kick up and down | Synonyms: butterfly stroke |
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| (noun) diurnal insect typically having a slender body with knobbed antennae and broad colorful wings | - |
| butterflyfish | (noun) tropical fish with huge fanlike pectoral fins for underwater gliding; unrelated to searobins | Synonyms: flying gurnard, flying robin |
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