Pertaining to or obtained by the signalling apparatus called a heliograph (see heliograph, n. 4).
| 单词 | θ191729 |
| 释义 | society > communication > indication > signalling > visual signalling > heliography > [adjective] (1) heliographic1880 Pertaining to or obtained by the signalling apparatus called a heliograph (see heliograph, n. 4). |
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