MACH
\mˈɑːk], \mˈɑːk], \m_ˈɑː_k]\
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Austrian physicist and philosopher who introduced the Mach number and who founded logical positivism (1838-1916)
By Princeton University
Word of the day
Snake's-head
- Guinea-hen flower; -- so called in England because its spotted petals resemble the scales of a snake's head.