(geology) Pertaining to sediments or facies deposited in comparatively deep and motionless water, such as an association of black shales and dark limestones deposited in a stagnant basin.
The suspended member of a fixed partial denture; an artificial tooth on a fixed partial denture or an isolated tooth on a removable partial denture. It replaces a lost natural tooth, restores its function, and usually occupies the space previously occupied by the natural crown.

Pontic. (Rosenstiel/Land/Fujimoto, 2001)