Visible or perceptible presentation; appearance; something perceived.
A group of plants or animals having similar appearance.
A mineral with a unique chemical formula whose crystals belong to a unique crystallographic system.
A category in the classification of organisms, ranking below genus; a taxon at that rank.
Either of the two elements of the Eucharist after they have been consecrated.
A component part of compound medicine; a simple.
A particular type of atom, molecule, ion or other particle.
Type or kind. (Compare race.)
Coin, or coined silver, gold, or other metal, used as a circulating medium; specie.
The ability of a program to examine at run time the type or properties of an object.