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 icosahedron icosahedron /ˌaɪkoʊsəˈhiːdrən/

noun

  1. Any polyhedron having twenty plane faces  ( icosahedron )
    any polyhedron having twenty plane faces
     A standard 20-sided dice is an example of an icosahedron.
    A standard 20-sided dice is an example of an icosahedron.


 ephemerid ephemerid /ɪˈfɛmərɪd/

noun

  1. Short-lived insect  ( ephemerid , ephemeropteran )
    short-lived insect


 paediatrics paediatrics /piːdiːˈætrɪks/

noun

  1. [Canadian, British] The branch of medicine concerned with the treatment of infants and children  ( paediatrics [Canadian, British] , pediatric medicine [ N. American] , pediatrics [ N. American] , pedology [ N. American] , paediatric medicine [Canadian, British] )
    the branch of medicine concerned with the treatment of infants and children
     The paediatrics department is busy with young children getting their vaccinations
    The paediatrics department is busy with young children getting their vaccinations


 achromatic lens achromatic lens /ˌeɪkrəˈmætɪk lɛnz/

noun

  1. A compound lens system that forms an image free from chromatic aberration  ( achromatic lens , achromat )
    a compound lens system that forms an image free from chromatic aberration
     The scientist used the achromatic lens in his telescope to obtain images without chromatic aberration.
    The scientist used the achromatic lens in his telescope to obtain images without chromatic aberration.