nex•us (ˈnɛk səs)
n., pl. nex•us•es, nex•us.
1. a means of connection; tie; link.
2. a connected series or group.
3. the core or center, as of a matter or situation.
4. a specialized area of the cell membrane involved in intercellular communication and adhesion.
[1655–65; < Latin nexus a binding, joining, fastening, derivative of nect(ere) to bind, fasten]