A translucent paper on which may be traced the design of whatever it is placed on.

(paleontology) A type of fossil reflecting the reworking of sediments and hard substrates by organisms, rather than the physical remains of the organism itself. This includes structures such as burrows, trails, impressions, coprolites and borings.

plural of trace fossil

(chemistry) A chemical element present in a sample in very small quantities.

(geology) A line drawn on a map to represent the position of a fault line.

(computer graphics) A technique that produces realistically shaded images by projecting imaginary light rays to determine which parts of an object should be illuminated.

(programming) A hierarchical trace of the function calls made by a program, used in debugging.

(botany) An extension of vascular tissue from a plant's stem into a nearby leaf, resulting in a leaf gap in the plant's stele.

The work of a skip tracer; the attempt to locate an individual who has deliberately disappeared.

A copyright infringement detection system which adds a unique salt to each copy of the material so that, if it is leaked, the person who leaked it can be identified.