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saddleback board |
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threshold 1. A strip fastened to the floor beneath a door, usually required to cover the joint where two types of floor material meet; may provide weather protection at exterior doors. Also See doorsill. 2. In illumination engineering, the value of physical stimulus which permits an object to be seen a specified percentage of the time with specified accuracy. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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