sə̇ˌnaptəˈsȯrēə noun plural
Usage: capitalized
Etymology: New Latin, from Greek synaptos + New Latin -sauria
: a subclass of Reptilia comprising Permian and Mesozoic typically aquatic or amphibious reptiles with temporal openings high on the roof of the skull and including the orders Protorosauria and Sauropterygia
• syn·ap·to·sau·ri·an ̷ ̷| ̷ ̷ ̷ ̷| ̷ ̷rēən adjective