millimetr

/millimetr/

Cases

SingularPluralWhen to use it
nominativemillimetrthe millimetremillimetrlethe millimetresthe plain dictionary form — the doer of the sentence
genitivemillimetrnithe millimetre'smillimetrlenithe millimetres'the owner — whose it is
accusativemillimetrnithe millimetre (as the object)millimetrlenithe millimetres (as the object)a specific, known object — whom or what
dativemillimetrgeto the millimetremillimetrlegeto the millimetresdirection or recipient — to where, to whom
locativemillimetrdeat / in the millimetremillimetrledeat / in the millimetreswhere it is; also having — mende bar, "I have it"
ablativemillimetrdenfrom the millimetremillimetrledenfrom the millimetreswhere it comes from; also "than" when comparing
When to use each case
nominative
the plain dictionary form — the doer of the sentence
genitive
the owner — whose it is
accusative
a specific, known object — whom or what
dative
direction or recipient — to where, to whom
locative
where it is; also having — mende bar, "I have it"
ablative
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
mymillimetrimmy millimetremillimetrlerimmy millimetres
yourmillimetringyour millimetremillimetrleringyour millimetres
his / hermillimetrihis / her millimetremillimetrlerihis / her millimetres
ourmillimetribizour millimetremillimetrleribizour millimetres
you all'smillimetrigizyou all's millimetremillimetrlerigizyou all's millimetres
theirmillimetrleritheir millimetremillimetrleritheir millimetres

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