A category in the classification of organisms, ranking below genus; a taxon at that rank.
A group of plants or animals having similar appearance.
A mineral with a unique chemical formula whose crystals belong to a unique crystallographic system.
Either of the two elements of the Eucharist after they have been consecrated.
Visible or perceptible presentation; appearance; something perceived.
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.
A rank in a taxonomic classification below species and (if present) subspecies, and above form; hence, an organism of that rank.
The total number of distinct states of a system; also, the logarithm to the base 2 of the total number of distinct states of a system.
An animal or plant (or a group of such animals or plants) with characteristics causing it to differ from other animals or plants of the same species; a cultivar.
In universal algebra: an equational class; the class of all algebraic structures of a given signature, satisfying a given set of identities.
A specific form of a language, neutral to whether that form is an accent, dialect, register, etc., and to its prestige level; an isolect or lect.
A collection or number of different things.
The kind of entertainment given in variety performances or shows; also, the production of, or performance in, variety performances or shows.
A deviation or difference.
A stamp, or set of stamps, which has one or more characteristics (such as colour, paper, etc.) differing from other stamps in the same issue, especially if such differences are intentionally introduced.
The quality of being varied; diversity.
A specific variation of something.