pulsar

the word 'pulsar' is a modern scientific coinage from the mid-20th century. it is a portmanteau, blending the english word 'pulse', which itself derives from latin 'pulsus' (a beating, thrust), with the suffix '-ar', commonly used in astronomy (as in 'quasar'). the term was created to describe the newly discovered astronomical objects that emit highly regular pulses of radio waves, likening their rhythmic signals to a heartbeat. thus, the literal construction "pulse + object" directly and logically captures the defining characteristic of these stellar remnants.

Structure: puls(e) + ar puls (from latin 'pulsus', meaning a beating or pulse, functioning as the core root) + ar (a noun-forming suffix in english, often used in scientific terms to denote an agent or object associated with the root, from latin '-aris').