(chemistry) A covalent bond (or series of bonds) between adjacent chains of a polymer / (biochemistry) A similar bond between strands of nucleic acid

(chemistry) To join polymer chains together to form one single molecule. An object made from a crosslinked material contains only one supergiant molecule. Crosslinking may take place through covalent bonds or ionic bonds

(colloquial) A hypothetical primate once thought necessary to explain a perceived evolutionary gap between apes and humans. / (figuratively) Any sought-after or valuable intermediary figure or position.

(firearms) A pressed metal or plastic link, used to join cartridges for a machine gun. When the cartridge is removed during loading, the link is expelled.

(slang, Internet, derogatory) Someone who goes to great lengths to get other people to link to his/her website or blog.

(Internet) A hyperlink that links to another website or domain.

(Internet) A hyperlink that links to another page on the same Web site.

Alternative spelling of cufflink

(SEO) Links added to a web page for the purpose of spamdexing.

(Internet, Wiktionary and WMF jargon) A red hyperlink that directs to a nonexistent page of a wiki.