(chemistry) any compound which contains more than eight formally assignable electrons in a valence shell directly associated with the central atom in direct bonding with a number of ligands

(chemistry) a crystalline solid consisting of a host lattice containing voids into which guest atoms or molecules are inserted

(inorganic chemistry) any solid material, composed of two or more metal atoms in a definite proportion, that has a definite structure which differs from those of its constituent metals

plural of component

(chemistry) a macrocycle

(physics, chemistry) The identities, and relative numbers, of the elements that make up any particular compound

(chemistry) any of a class of compounds having five-membered ring heterocycles (or their benzo derivatives) which possess a sextet of π-electrons in association with the atoms comprising the ring, but which cannot be represented by any one covalent or polar structure; typically the ring structure contains both positive and negative delocalised charges which cannot be associated with any one ring atom, and the negative charge can also be associated with a conjugated exocyclic atom (typically oxygen, sulfur, or nitrogen).

(chemistry) any compound in which two or more metal atoms are bonded to one another

(organic chemistry) Any compound which exhibits aromaticity.

(organic chemistry) Any cyclophane in which the para positions of a benzene ring are connected by a bridge of at least 10 atoms.