Dictionary![]() ![]() spec•tro•he•li•o•scopePronunciation: (spek"trō-hē'lē-u-skōp"), [key] —n. 1. a spectroheliograph. 2. a similar instrument, used for visual instead of photographic observations. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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