A quaternary compound.
The Quaternary period or the system of deposits laid down during it.
Relating to or in number base four
Of fourth rank or order
Of a mathematical expression containing e.g. x⁴
quaternary ammonium
composed of four elements
A tetravalent atom or radical.
A unit of land area of two by two (that is, four) square kilometres.
A group of four basis vectors for a four-dimensional manifold in differential geometry.
A group of four haploid and immature pollen grains in tetrahedral fashion produced by meiotic microsporogenesis.
Two pairs of sister chromatids (a dyad pair) aligned in a certain way and often on the equatorial plane during the meiosis process.
A group of four things.