• Webster's Revised Unabridged Dictionary
    • Tilestone (Geol) A kind of laminated shale or sandstone belonging to some of the layers of the Upper Silurian.
    • Tilestone A tile of stone.
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Century Dictionary and Cyclopedia
    • n tilestone A tile; brick.
    • n tilestone Any stone suitable for making tiles, or which can be used for roofing, but splitting into layers too thick to be properly called slate (see slate); thin-bedded flagstone. The term tile-stone was applied by Murchison to the Downton sandstones and Ledbury shales, which are beds of passage between the Silurian and Old Red Sandstone in Wales.
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In literature:

Spaulding Miss Jennie Tileston, 789.
"Woman's Work in the Civil War" by Linus Pierpont Brockett
The finely laminated Tilestones of England were deposited evidently in a calm sea.
"The World's Greatest Books - Volume 15 - Science" by Various
Children's Book of Ballads, Mary W. Tileston.
"Scouting For Girls, Official Handbook of the Girl Scouts" by Girl Scouts
By MARY W. TILESTON, author of "Daily Strength for Daily Needs," etc.
"The Land of Lost Toys" by Juliana Horatia Ewing

In news:

Peter Ayer Tileston died peacefully with his family at his side in Palo Alto, Calif on Nov 15, 2012.