alitrunk
/ˈalɪtrʌŋk/Entomology
noun
The mesosoma of a hymenopterous insect, especially an ant, consisting of the thorax and the propodeum fused together.
Origin
Early 19th century; earliest use found in William Kirby (1759–1850), entomologist and naturalist. From classical Latin āla wing + trunk after French tronc alifère.