The Spanish word 'tórax' (meaning 'thorax' or 'chest') comes from Latin 'thorax', which in turn was borrowed from Ancient Greek 'θώραξ' (thōrax). In Ancient Greek, this word had the meaning of both 'chest' (the body part) and 'breastplate' (the piece of armor that protected the chest). The word maintained its anatomical meaning as it passed from Greek through Latin and into Spanish, with very little change in either form or meaning over thousands of years.

The word 'tórax' is a relatively technical anatomical term in Spanish, and there aren't many simpler or more common Spanish words that share its etymology. However, you might encounter it in compound words like 'torácico' (thoracic) in medical or anatomical contexts.

English speakers might recognize this word's connection to 'thorax', which is the exact same anatomical term in English. Both Spanish 'tórax' and English 'thorax' share the same Greek ancestor. English also uses this root in related medical terms like 'thoracic' (relating to the chest), 'intrathoracic' (within the chest), and 'thoracotomy' (surgical incision of the chest wall). The similarity between the Spanish and English words can help English speakers remember its meaning.