English

abdominothoracic arch

abdominothoracic + arch

Proto-Indo-European *h₂erkʷ-

…

Latin arcus ‘a bow, arc, arch’

Old French arc

Old French arche ‘an arch’

Middle English arch

English arch

Today it means

noun The costal arch; anterior and lateral boundary between the abdomen and the thorax.

Language periods are conventional ranges, not dates for this word.

Etymograph / abdominothoracic arch