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Word: photoperiodist (lookup in dictionary) (lookup stats)
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Usage:

...Hartford, Conn, lives a man who has proved that the mating cycles of many birds and animals can be controlled by artificially altering the length of their days & nights (TIME, June 28, 1943). His name is Dr. Thomas Hume Bissonnette, and he is Trinity College's photoperiodist. Last week Dr. Bissonnette quoted Tennyson...

Author: /time Magazine | Title: Science: Scientific Cupid | 9/16/1946 | See Source »

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