mesosuchian adjective 1noun 1forms 2 adjective1 •Relating to or being part of the informal group †Mesosuchia.Crocodilians contribute little to the solution of the Late Cretaceous interchange problem. A number of "mesosuchian" families are present in the Cretaceous of South America. — 1985 noun1 •Any of the informal group †Mesosuchia of terrestrial, semi-aquatic, or fully aquatic crocodylomorph reptiles, previously thought to be true cocodiles.The kind of change which would convert a Parasuchian into a Mesosuchian, would, if continued, convert a Mesosuchian into an Eusuchian. — 1859 formsMesosuchians · mesosuchians
