Pore, n, (P^V) - as used in fractography, a discrete cavity or void in a solid material.

NOTE - The codes in parenthesis after each term are provided for use in statistical analysis. A superscript "V" stands for inherently volume-distributed origins.

Porous Seam, n, (PS^V) - as used in fractography, a 2-dimensional area of porosity or microporosity.

Porous Region, n, (PR^V) - as used in fractography, a 3-dimensional area of porosity or microporosity.

Agglomerate, n, (A^V) - as used in fractography, a cluster of grains, particles, platelets or whiskers or a combination thereof, present in a larger solid mass.

Inclusion, n, (I^V) - as used in fractography, a foreign body from other than the normal composition of the bulk advanced ceramic.

Compositional Inhomogeneity, n, (CI^V) - as used in fractography, a microstructural irregularity related to the non-uniform distribution of an additive, a different crystalline or glass phase or in a multi-phase material, the non-uniform distribution of a second phase.

Large Grain(s), n, (LG^V) - as used in fractography, a single (or cluster of) grain(s) having a size significantly greater than that encompassed by the normal grain size distribution. [C1145]

Crack, n, (CK^V) - as used in fractography, a plane of fracture without complete separation.