Keystones is a 9 letter English word. It's valid Scrabble word worth 15 points. It's valid Words with friends word worth 15 points.
You can make 258 anagrams from letters in keystones (eeknossty).
First recorded in 1630-40; key1 + stone
From the pavement to the keystone of its vault is but 132 French feet—about 150 English.
They have made keystone XL the poster child of their climate-change efforts.
Therefore, we should—you guessed it—develop the Canadian tar sands and build the keystone pipeline.
From the looks of it, mistletoe is a keystone species and plays a crucial role in that forest ecosystem.
But if Clinton waded into the natural gas debate, she entirely avoided the keystone one.
Congress is nearing a vote on the keystone XL pipeline, and lawmakers made their cases for—and against—it Sunday.
On this is the inscription: “Her loss was that as of a keystone to an arch.”
That is the keystone of American liberty—'malice toward none.'
In fact, not a few of us think that the Strathcona is the keystone of the Mission.
The keystone of the arch had been removed, the downfall of the whole must follow.