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
Quinones
- Hydrocarbon rings which contain two moieties position. They can be substituted in any position except at the ketone groups.