| reflection density | |
| —n | |
| physics D, Former name: optical density a measure of the extent to which a surface reflects light or other electromagnetic radiation, equal to the logarithm to base ten of the reciprocal of the reflectance | |
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| a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes. |
| a gadget; dingus; thingumbob. |