pika Syllabification: (pi·ka)Pronunciation: /ˈpīkə, ˈpē-/Definition of pika noun a small mammal related to the rabbits, having rounded ears, short limbs, and a very small tail. Family Ochotonidae and genus Ochotona: many species, including the collared pika (O. collaris) of western North America Origin: early 19th century: from Tungus piikapika in other Oxford dictionaries Definition of pika in the British & World English dictionary