thorax
n.the front part of an insect's body, or the middle part of a human's body between the neck and the waist.
n.the anterior segment of an insect's body, or the middle section of the human torso between the neck and the pelvis.
“The thorax of the beetle is very hard.”
“Insects use their thorax to attach their wings and legs, allowing for complex movement.”
“The thorax contains the heart and the primary respiratory organs in many arthropods, serving as a central hub for circulation and locomotion.”
“Slender beetles have long, narrow heads and thoraxes, allowing them to insert their heads deep into the shells of large snails.”
From Latin thorax, from Ancient Greek θώραξ (thṓrax, “a breastplate, cuirass, corslet”).
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.