The Spanish word 'pulmonar' (meaning 'pulmonary' or 'relating to the lungs') comes from the Latin word 'pulmonaris', which was formed by combining 'pulmo' (meaning 'lung') with the suffix '-aris' (meaning 'relating to'). The Latin 'pulmo' itself can be traced back to the Ancient Greek word 'pleumon' (πλεύμων), also meaning 'lung'.

This is a clear example of how medical and anatomical terminology in Spanish often preserves Latin forms, which were themselves sometimes borrowed from Greek. The word formation is straightforward: adding a suffix meaning 'relating to' to the word for 'lung' created an adjective describing things connected to the lungs.

A simpler related Spanish word is 'pulmón' (meaning 'lung'), which comes directly from the same Latin root 'pulmo'. This connection makes it easy to remember that 'pulmonar' refers to anything relating to the lungs or 'pulmones' in Spanish.

English speakers can easily connect 'pulmonar' to several similar English words: 'pulmonary' (relating to the lungs), 'pulmonic' (relating to the lungs), and even 'pneumonia' (though this comes from a slightly different Greek root related to breathing). The English 'pulmonary' and Spanish 'pulmonar' are essentially cognates, both deriving from Latin 'pulmonaris', making this an easy word to remember for English speakers.