eltir

/ eltir /

Cases

SingularPluralWhen to use it
nominative eltir the lambskin eltirle the lambskins the plain dictionary form — the doer of the sentence
genitive eltirni the lambskin's eltirleni the lambskins' the owner — whose it is
accusative eltirni the lambskin (as the object) eltirleni the lambskins (as the object) a specific, known object — whom or what
dative eltirge to the lambskin eltirlege to the lambskins direction or recipient — to where, to whom
locative eltirde at / in the lambskin eltirlede at / in the lambskins where it is; also having — mende bar, "I have it"
ablative eltirden from the lambskin eltirleden from the lambskins where it comes from; also "than" when comparing

The endings are the same ones the pronouns wear — that page explains when each case is used.

With an owner

One ownedSeveral owned
my eltirim my lambskin eltirlerim my lambskins
your eltiriŋ your lambskin eltirleriŋ your lambskins
his / her eltiri his / her lambskin eltirleri his / her lambskins
our eltiribiz our lambskin eltirleribiz our lambskins
you all's eltirigiz you all's lambskin eltirlerigiz you all's lambskins
their eltirleri their lambskin eltirleri their lambskins

The overlap in the last rows is real, not a mistake: eltirleri can mean "his / her lambskins", "their lambskin", or "their lambskins" — context decides.