Definition of Oort, Jan in English:

Oort, Jan

Syllabification: Oort, Jan
Pronunciation: /ôrt
( 1900–92), Dutch astronomer; full name Jan Hendrik Oort. He proved that the galaxy rotates and determined the position and orbital period of the sun within it.

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Word of the day flippant
Pronunciation: ˈflipənt
not showing a serious or respectful attitude