limˈnäsələ̇s noun
Usage: capitalized
Etymology: New Latin, from limn- + Greek skelis, schelis rib of beef; akin to Greek skelos leg — more at cylinder
: a genus of very primitive Lower Permian reptiles (order Cotylosauria) of the southwestern United States that are clumsily built creatures about five feet long somewhat like lizards and now thought to be very near the point of divergence between amphibians and reptiles