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"heliograph"¿¡ ´ëÇÑ ¼¼ºÎ °Ë»ö °á°úÀÔ´Ï´Ù
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WordNet ÀÏ¹Ý ¿µ¿µ »çÀü °Ë»ö °á°ú : 2 ÆäÀÌÁö: 1
heliograph an apparatus for sending telegraphic messages by using a mirror to turn the sun's rays off and on
heliograph signal with a heliograph
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