twisted grain

interlocked grain, twisted grain

Wood in which the fibers are angled in different directions every few annual rings; produces ribbon-stripe grain when quartersawn.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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Elm has twisted grain and it is difficult to split by hand.
(See picture 2) Sometimes a chunk has such a twisted grain due to limbs you may need a second wedge to finish.
Woodland areas such as that of his native Belmont, N.Y., often have an abundance of "junk" timber that has little commercial value because of its small diameter, twisted grain or other imperfections.