UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ləmɛtr/US:USA pronunciation: respellingUSA pronunciation: respelling(lə metrə)

WordReference Random House Unabridged Dictionary of American English © 2020
Le•maî•tre  (lə metrə),USA pronunciation n. 
    Fran•cois É•lie Jules  (lə metrə),USA pronunciation 1835–1915, French critic and dramatist. Abbé Georges É•douard  (lə metrə),USA pronunciation 1894–1966, Belgian astrophysicist and priest: formulated big-bang theory.
Collins Concise English Dictionary © HarperCollins Publishers::
Lemaître /French: ləmɛtr/ n
  1. Abbé Georges (Édouard) (ʒɔrʒ). 1894–1966, Belgian astronomer and priest, who first proposed the big-bang theory of the universe (1927)

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