D defs.my
Entry 1 sense Webster, 1913

Lungfish

/lŭng'-fĭshˌ/ · Lung·fish · IPA /lˈʌŋfˌɪʃ/
01 n. Any fish belonging to the Dipnoi; -- so called because they have both lungs and gills.
  1. 1.
    Any fish belonging to the Dipnoi; -- so called because they have both lungs and gills.(Zool.)