noun, plural nexuses, nexus.
a means of connection; tie; link.
a connected series or group.
the core or center, as of a matter or situation.
Cell Biology. a specialized area of the cell membrane involved in intercellular communication and adhesion.

1655–65; < Latin nexus a binding, joining, fastening, equivalent to nect(ere) to bind, fasten, tie + -tus suffix of v. action, with tt > s Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nexus (ˈnɛksəs)
n , pl nexus
1.  a means of connection between members of a group or things in a series; link; bond
2.  a connected group or series
[C17: from Latin: a binding together, from nectere to bind]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1663, "bond, link, means of communication," from L. nexus, pp. of nectere "to bind," from PIE base *ned- "to bind, tie" (see net (n.)).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

nexus nex·us (něk'səs)
n. pl. nexus or nex·us·es
See gap junction.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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