AMPHIPODOUS
\ˌamfɪpˈɒdəs], \ˌamfɪpˈɒdəs], \ˌa_m_f_ɪ_p_ˈɒ_d_ə_s]\
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From Amphipoda, an order of Crustacea, of which the anterior three pairs of abdominal appendages are more strongly developed for swimming, the remaining three pairs being adapted for jumping, hence,  having feet both for walking and for swimming.
By Henderson, I. F.; Henderson, W. D.
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Euclidean Geometry
 geometry based on Euclid's axioms: e.g., only one line can be drawn through a point parallel to another