Definitions

1. noun

A fine, silky or cottony growth of crystals on a surface, especially a mineral deposit.

“The geologist studied the timaline formation on the cave wall and determined it was a rare mineral deposit.”

2. noun

A type of fine, silky or cottony lichen, especially one with a distinctive white or yellowish growth.

“The biologist identified the timaline lichen on the tree trunk and noted its unusual appearance.”