sauropterygian

enUK

saur·op·ter·yg·i·an

S0104150 (sô-rŏp′tə-rĭj′ē-ən)n. Any of various extinct aquatic reptiles of the group Sauropterygia that flourished during the Mesozoic Era and included the plesiosaurs.
[From New Latin Sauropterygia, superorder name : Greek sauros, lizard + Greek pterux, pterug-, wing, flipper; see pet- in Indo-European roots.]
saur·op′ter·yg′i·an adj.

sauropterygian

(sɔːˌrɒptəˈrɪdʒɪən) nany carnivorous Mesozoic marine reptile of the group Sauropterygia, with paddle-like limbsadjof or relating to reptiles of the Sauropterygia