DIOPTRE
\dɪˈɒptə], \dɪˈɒptə], \d_ɪ__ˈɒ_p_t_ə]\
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A unit employed by oculists in numbering glasses according to the metric system; a refractive power equal to that of a glass whose principal focal distance is one meter.
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Word of the day
hydromorphic
- [Greek] Structurally adapted to an aquatic environment, as organs of water plants.