covalent bond

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A chemical bond formed by the sharing of one or more electrons, especially pairs of electrons, between atoms.

Wiktionary

1. n. chemistry A type of chemical bond where two atoms are connected to each other by the sharing of two or more electrons.

GNU Webster's 1913

1. n. an attractive force between two atoms of a molecule generated by the merging of an electron orbital of each atom into a combined orbital in the molecule. Such bonds vary in strength, but in molecules of substances typically encountered in human experience (as, water or alcohol) they are sufficiently strong to persist and maintain the identity and integrity of the molecule over appreciable periods of time. Each such bond satisfies one unit of valence for each of the atoms thus bonded. Contrasted with hydrogen bond, which is weaker and does not satisfy the valence of either atom involved.

WordNet 3.0

1. n. a chemical bond that involves sharing a pair of electrons between atoms in a molecule