Definition of yak :
1. A bovine mammal ( Poephagus grunnies) native of the high plains of Central Asia. Its neck, the outer side of its legs, and its flanks, are covered with long, flowing, fine hair. Its tail is long and bushy, often white, and is valued as an ornament and for other purposes in India and China. There are several domesticated varieties, some of which lack the mane and the long hair on the flanks. Called also chauri gua, grunting cow, grunting ox, sarlac, sarlik, and sarluc.
2. To show mirth, satisfaction, or derision, by peculiar movement of the muscles of the face, particularly of the mouth, causing a lighting up of the face and eyes, and usually accompanied by the emission of explosive or chuckling sounds from the chest and throat; to indulge in laughter.
jaw, chatter, run on, chattering, go on, words, chitchat, prattle, jabber, spiel, jape, prate, joke, gag, babble, Bos Grunniens, palaver, cackle, gab, yack, wheeze, jest, yakety-yak, run off at the mouth, clack, blabber, gas, laugh
mammal (part of speech: noun)
fox, hippopotamus, camel, cavy, ibex, donkey, llama, hamster, hare, opossum, antelope, weasel, sable, echidna, reindeer, mouse, koala, dog, hog, mole, sloth, rabbit, horse, dingo, burro, hyena, tiger, ox, coyote, elephant, caribou, ocelot, lion, leopard, gazelle, mink, cow, possum, platypus, moose, arctic fox, cat, otter, zebra, jaguar, panther, wallaby, lynx, giraffe, gopher, polecat, squirrel, camelopard, bobcat, ermine, panda, mule, deer, chipmunk, bison, alpaca, goat, cheetah, wolf, rhinoceros, wombat, kangaroo, puma, buffalo, stoat, stag, marmot, sheep, shrew, cougar, ferret, hedgehog, porcupine, beaver, gnu, bear, swine, dromedary, skunk, pig, mongoose, chinchilla, jackal, rat, raccoon, lemming, elk, ass
- Elk and yak, the bulls of Bashan and of Babylon, mammoth and mastodon, they come trooping to the sunken sea, Lacus Mortis. - "Ulysses", James Joyce.
- A cord of yak- hair, about forty or fifty yards long, was now produced. - "An Explorer's Adventures in Tibet", A. Henry Savage Landor.
- By this time it began to grow dark, and having descended into the tent, yak and all, we ate our food and waited. - "Ayesha The Further History of She-Who-Must-Be-Obeyed", H. Rider Haggard.