copulae

Berit used "copulas" in her presentation, but I prefer, of course, copulae (sorry, can't get this in neat table format here): 

Case    Singular    Plural    Meaning
Nominative    copula    copulae    the link / the links
Genitive    copulae    copul¨¡rum    of the link / of the links
Dative    copulae    copul¨©s    to/for the link / to/for the links
Accusative    copulam    copul¨¡s    the link (object) / the links (object)
Ablative    copul¨¡    copul¨©s    by/with/from the link / by/with/from the links
Vocative    copula    copulae    O link! / O links!