(1) A chemical bond consisting of a hydrogen atom between two electronegative atoms (e.g., oxygen or nitrogen) with one side be a covalent bond and the other being an ionic bond
WiktionaryText
Noun
A weak bond in which a hydrogen atom in one molecule is attracted to an electronegative atom (usually nitrogen or oxygen) in the same or different molecule.
Verb
To bond to another species by means of hydrogen bonds. E.g. Water hydrogen bonds with itself.