Definition of lanthanide in English:
 lanthanide
noun ˈlanθənʌɪdˈlænθəˌnaɪd
Chemistry Any of the series of fifteen metallic elements from lanthanum to lutetium in the periodic table (atomic numbers 57–71).
See also rare earth
 Example sentencesExamples
-  Other particles containing yttria and some lanthanides are phosphors that be processed to form light-emitting devices.
 -  In such cases, a chelated lanthanide that is associated with one partner sensitizes an acceptor on a complementary partner when these species are within the typical Forster distance range of 3 to 9 nm.
 -  Indeed, to ‘flip’ acidic bicelles while maintaining well-ordered structures, only small concentrations of lanthanides can be added.
 -  The lanthanides make up the elements between barium and hafnium in Row 6 of the periodic table.
 -  Elements in this group are also known as the lanthanides after the first element in that group, lanthanum.
 
Origin
  
1920s: from lanthanum + -ide.
   Definition of lanthanide in US English:
 lanthanide
nounˈlænθəˌnaɪdˈlanTHəˌnīd
Chemistry Any of the series of fifteen metallic elements from lanthanum to lutetium in the periodic table.
See also rare earth
 Example sentencesExamples
-  Other particles containing yttria and some lanthanides are phosphors that be processed to form light-emitting devices.
 -  The lanthanides make up the elements between barium and hafnium in Row 6 of the periodic table.
 -  Indeed, to ‘flip’ acidic bicelles while maintaining well-ordered structures, only small concentrations of lanthanides can be added.
 -  Elements in this group are also known as the lanthanides after the first element in that group, lanthanum.
 -  In such cases, a chelated lanthanide that is associated with one partner sensitizes an acceptor on a complementary partner when these species are within the typical Forster distance range of 3 to 9 nm.
 
Origin
  
1920s: from lanthanum + -ide.