Answer | Crossword Clue |
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photophase | the light period of a photoperiodic cycle of light and dark |
photophases | PHOTOPHASE, the light period of a photoperiodic cycle of light and dark |
ultramicroscope | An optical microscope used to detect particles smaller than the wavelength of light by illuminating them at an angle and observing the light scattered by the Tyndall effect against a dark background |