DIOPTRA
\dɪˈɒptɹə], \dɪˈɒptɹə], \d_ɪ__ˈɒ_p_t_ɹ_ə]\
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An optical instrument, invented by Hipparchus, for taking altitudes, leveling, etc.
By Oddity Software
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An optical instrument, invented by Hipparchus, for taking altitudes, leveling, etc.
By Noah Webster.
Word of the day
Mustagh Range
- a mountain range in northern Kashmir; an extension of the Hindu Kush; contains 2nd highest peak