said of rays outside the visible spectrum at its red extremity; also ultra-red.
| 单词 | θ76534 |
| 释义 | the world > matter > physics > electromagnetic radiation > light > chromatism > [adjective] > infra-red (4) extra-red1860 said of rays outside the visible spectrum at its red extremity; also ultra-red. infra-red1881 Lying beyond the red end of the visible spectrum: the epithet of electromagnetic radiation (and of the part of the spectrum containing it) which… Subcategories:— relating to infra-red radiation (2) |
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