amphiumaPronunciation: /ˌamfɪˈjuːmə/Definition of amphiuma noun a fully aquatic eel-like amphibian with very small limbs, occurring in stagnant water and swamps in the south-eastern US. Family Amphiumidae and genus Amphiuma: three species Origin:modern Latin, probably formed irregularly from amphi- 'both' + Greek pneuma 'breath'amphiuma in other Oxford dictionaries Definition of amphiuma in the US English dictionary