Clyde Tombaugh Clyde Tombaugh /ˈklaɪd tɒmˈbɔː/

noun

1. United States astronomer who discovered the planet Pluto (1906-1997)  ( Clyde Tombaugh , Clyde William Tombaugh , Tombaugh )
   United States astronomer who discovered the planet Pluto (1906-1997)
   
   

 skin-dive skin-dive /ˈskɪnˌdaɪv/

noun

1. Underwater swimming without any more breathing equipment than a snorkel  ( skin diving , skin-dive )
   underwater swimming without any more breathing equipment than a snorkel
   
   

verb

1. (sport) swim underwater with no breathing apparatus other than a snorkel  ( skin-dive )
   (sport) swim underwater with no breathing apparatus other than a snorkel
   

 in-fighting in-fighting /ˈɪnˌfaɪtɪŋ/

noun

1. () Conflict between members of the same organization (usually concealed from outsiders)  ( in-fighting )
   conflict between members of the same organization (usually concealed from outsiders)
   
2. Boxing at close quarters  ( in-fighting )
   boxing at close quarters
    The boxing match was intense, with a lot of in-fighting between the two opponents.
   The boxing match was intense, with a lot of in-fighting between the two opponents.
   
   

 obturator obturator /ˈɒbtʊˌreɪtər/

noun

1. A prosthesis used to close an opening (as to close an opening of the hard palate in cases of cleft palate)  ( obturator )
   a prosthesis used to close an opening (as to close an opening of the hard palate in cases of cleft palate)
    The patient with a cleft palate was provided with an obturator to improve speech.
   The patient with a cleft palate was provided with an obturator to improve speech.