American Heritage Dictionary
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Century Dictionary
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GNU Webster's 1913
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WordNet
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Elsewhere on the web
It's because the cycles of what is called 'cold recharge' - where weeks of below-freezing temperatures, followed by warmer temperatures - are shortening to the point where sugar maples are not producing the sap which is later boiled down to make maple syrup.— TreeHugger
The bags collect the sap which is then boiled down to make maple syrup and sold for charity.— WWMT.com : News
All previous attempts to fire the Grass had been made when the sap was running and it was thought that in its dryer condition some measure of success might be obtained.— Greener Than You Think
The kettle which contained the sap was also open for the reception of the dust, and smoke, and falling leaves, and forms of dirt innumerable The first advance on this primitive method was made by building a rough arch of stone around the kettle to retain the heat and economize fuel.— The New England Magazine Volume 1, No. 3, March, 1886 Bay State Monthly Volume 4, No. 3, March, 1886

American Heritage Dictionary (2)
Century Dictionary (5)
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