单词 | needle |
释义 | needle [`nēd·ǝl] BOTANY A slender-pointed leaf, as of the firs and other evergreens. COMPUTER SCIENCE A slender rod or probe used to sort decks of edge- punched cards by inserting it through holes along the margin of the deck and vibrating the deck so that cards having that particular hole are retained, but those having a notch cut at that hole position drop out. DESIGN ENGINEERING 1. A device made of steel pointed at one end with a hole at the other; used for sewing. 2. A device made of steel with a hook at one end; used for knitting. ENGINEERING 1. A piece of copper or brass about 1/2 inch (13 millimeters) in diameter and 3 or 4 feet (90 or 120 centimeters) long, pointed at one end, thrust into a charge of blasting powder in a borehole and then withdrawn, leaving a hole for the priming, fuse, or squib. Also known as pricker. 2. A thin pointed indicator on an instrument dial. ENGINEERING ACOUSTICS See <<stylus>> GEOLOGY A pointed, elevated, and detached mass of rock formed by erosion, such as an aiguille. HYDROLOGY A long, slender snow crystal that is at least five times as long as it is broad. MINERALOGY A needle-shaped or acicular mineral crystal. |
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