My fingers found a tiny groove in the wall, and when I pressed against it a small, flat section of stone clicked and retracted.

Instead, they say, the striders have tiny hairs on their legs with even tinier grooves that trap air.

Each of these hairs, in turn, has tiny grooves, on the order of nanometers.

The clip, called a corpusculum, has a tiny groove in one side.

He drew a slide from the desk and slipped his list of names into a pair of tiny grooves that lay beneath it.

Danny espied tiny grooves in their sides, just below their armpits.

Her face was deeply lined, with hundreds of tiny grooves crisscrossing one another.

She was wondering what else to try when her fingernail slid into a tiny groove on the inside edge of the uppermost star.

There are 119 tiny grooves on the edge of an American quarter, but a dime has only 118.

He described how using films covered with tiny grooves called riblets could save the world's airlines billions.