You can describe your kitten as your young feline friend, since feline describes anything having to do with cats.

The adjective feline is useful when you're talking about cats — just as canine describes dogs, and ursine describes bears. You might talk about the special feline food and toys you buy for your pet, or describe his feline beauty. You can even describe a person as feline, if something about him or her is catlike. The Latin root felinus means "of or belonging to a cat," from feles, "cat."

Definitions of feline
  1. adjective
    of or relating to cats
    feline fur”
  2. noun
    any of various lithe-bodied roundheaded fissiped mammals, many with retractile claws
    synonyms: felid
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    cat, true cat
    feline mammal usually having thick soft fur and no ability to roar: domestic cats; wildcats
    big cat, cat
    any of several large cats typically able to roar and living in the wild
    Felis catus, Felis domesticus, domestic cat, house cat
    any domesticated member of the genus Felis
    any small or medium-sized cat resembling the domestic cat and living in the wild
    Panthera pardus, leopard
    large feline of African and Asian forests usually having a tawny coat with black spots
    Panthera uncia, ounce, snow leopard
    large feline of upland central Asia having long thick whitish fur
    Felis onca, Panthera onca, jaguar, panther
    a large spotted feline of tropical America similar to the leopard; in some classifications considered a member of the genus Felis
    Panthera leo, king of beasts, lion
    large gregarious predatory feline of Africa and India having a tawny coat with a shaggy mane in the male
    Panthera tigris, tiger
    large feline of forests in most of Asia having a tawny coat with black stripes; endangered
    offspring of a male lion and a female tiger
    tiglon, tigon
    offspring of a male tiger and a female lion
    Acinonyx jubatus, cheetah, chetah
    long-legged spotted cat of Africa and southwestern Asia having nonretractile claws; the swiftest mammal; can be trained to run down game
    saber-toothed tiger, sabertooth
    any of many extinct cats of the Old and New Worlds having long swordlike upper canine teeth; from the Oligocene through the Pleistocene
    type of:
    a terrestrial or aquatic flesh-eating mammal
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