phragma
/ˈfraɡmə/noun
Entomology. A transverse partition between segments of the thorax or between the metathorax and abdomen, occurring in some insects.
Origin
Early 19th century; earliest use found in William Kirby (1759–1850), entomologist and naturalist. From scientific Latin phragma from ancient Greek ϕραγματ-, ϕράγμα fence, screen from the stem of ϕράσσειν (Attic ϕράττειν) to fence in, of unknown origin + -μα.