The Spanish word 'pleura' comes directly from the Ancient Greek word 'πλευρά' (pleura), which meant 'side' or 'rib'. While the Greek term referred to the general anatomical area of the side or ribs, the meaning became more specific in medical terminology to refer to the membrane that covers the lungs. This semantic narrowing makes sense since this membrane is located along the sides of the chest cavity, next to the ribs.

There aren't many common Spanish words directly related to 'pleura', as it remains primarily a technical medical term. However, you might encounter related medical terms like 'pleuresía' (pleurisy) or 'pleural' (pleural), which all refer to this same anatomical structure or conditions affecting it.

The English word 'pleura' is identical to the Spanish word and shares the same Greek origin. Related English medical terms include 'pleural', 'pleurisy', and 'pleuritic'. All these terms maintain their connection to the original Greek meaning by referring to the membrane along the sides of the chest cavity or conditions affecting this area.