Here's a quote from
http://composite.about.com/library/weekly/aa042897.htm
"If you look at a roll of fabric, some of the yarns run in the direction of the roll and are continuous for the entire length of the roll. These are the warp yarns. The short yarns which run crosswise to the roll direction are called the fill yarns. Warp yarns are usually called ends and fill yarns picks, but sometimes the fill yarns are also called ends. (The terms apply equally to rovings, but yarn will be used in the rest of the discussion for simplicity.)"
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