plural noun
Rhip·i·dis·tia | \ˌripəˈdistēə\

Definition of Rhipidistia 

: an order of extinct crossopterygian fishes that have the basal bones of the median fins united into one mass — see holoptychiidae , osteolepidae

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Other Words from Rhipidistia

rhipidistian \¦⸗⸗¦distēən \ adjective or noun
rhipidistid \-tə̇d \ adjective or noun

History and Etymology for Rhipidistia

New Latin, from rhipid- + Greek histia, plural of histion sail; akin to Greek histanai to cause to stand

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a state of commotion or excitement

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