pulsar pulsar /ˈpʊlsɝ/

noun

1. A degenerate neutron star; small and extremely dense; rotates very fast and emits regular pulses of polarized radiation  ( pulsar )
   a degenerate neutron star; small and extremely dense; rotates very fast and emits regular pulses of polarized radiation
    Astronomers detected signals from a distant pulsar.
   Astronomers detected signals from a distant pulsar.
   
   

 tarsier tarsier /ˈtɑːrsiər/

noun

1. Nocturnal arboreal primate of Indonesia and the Philippines having huge eyes and digits ending in pads to facilitate climbing; the only primate that spurns all plant material as food living entirely on insects and small vertebrates  ( tarsier )
   nocturnal arboreal primate of Indonesia and the Philippines having huge eyes and digits ending in pads to facilitate climbing; the only primate that spurns all plant material as food living entirely on insects and small vertebrates
   
   

 lightweight lightweight /ˈlaɪˈtweɪt/

adjective

1. () Weighing relatively little compared with another item or object of similar use  ( lightweight )
   weighing relatively little compared with another item or object of similar use
    A lightweight fabric
   a lightweight fabric
    Lightweight wood
   lightweight wood
   
2. Having no importance or influence  ( lightweight )
   having no importance or influence
    A lightweight intellect
   a lightweight intellect
   

noun

1. () A professional boxer who weighs between 131 and 135 pounds  ( lightweight )
   a professional boxer who weighs between 131 and 135 pounds
   
2. A wrestler who weighs 139-154 pounds  ( lightweight )
   a wrestler who weighs 139-154 pounds
   
3. An amateur boxer who weighs no more than 132 pounds  ( lightweight )
   an amateur boxer who weighs no more than 132 pounds
    Samantha hopes to win the championship in the lightweight division this year.
   Samantha hopes to win the championship in the lightweight division this year.
   
   
4. Someone who is unimportant but cheeky and presumptuous  ( jackanapes [Archaic] , lightweight , whippersnapper [Informal] )
   someone who is unimportant but cheeky and presumptuous
   

 first sergeant first sergeant /fɜːrst ˈsɑːrdʒənt/

noun

1. A sergeant in the Army above the rank of staff sergeant and below master sergeant  ( first sergeant , sergeant first class )
   a sergeant in the Army above the rank of staff sergeant and below master sergeant