| transmission density | |
| —n | |
| physics τ, Former name: optical density a measure of the extent to which a substance transmits light or other electromagnetic radiation, equal to the logarithm to base ten of the reciprocal of the transmittance | |
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| a fool or simpleton; ninny. |
| a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes. |
| transmission density | |
noun | |
| (physics) a measure of the extent to which a substance transmits light or other electromagnetic radiation [syn: optical density] |