two year old(n = noun.animal) two-year-old horse - a racehorse that is two years old;
is a kind of bangtail, race horse, racehorse

academic year, age old, anomalistic year, any old way, astronomical year, bissextile year, calendar year, chip off the old block, christian year, church year, civil year, common year, dirty old man, each year, equinoctial year, every year, financial year, fiscal year, good old boy, good old days, great year, grow old, holy year, in two ways, intercalary year, jewish new year, leap year, light year, lunar year, mohammedan year, new year, off year, old, old age, old bag, old bailey, old boy, old boy network, old bulgarian, old bullion, old catholic, old catholic church, old church slavic, old church slavonic, old codger, old colony, old country, old days, old delhi, old dominion, old dominion state, old english, old english sheepdog, old faithful, old fashioned, old fogy, old french, old frisian, old geezer, old glory, old gold, old growth, old guard, old hand, old hat, old hickory, old high german, old icelandic, old irish, old ironsides, old italian, old lady, old lang syne, old latin, old line, old line state, old maid, old maid flower, old man, old man of the mountain, old man's beard, old master, old money, old nick, old norse, old north french, old north state, old person, old prussian, old rose, old salt, old saw, old saxon, old school, old school tie, old sledge, old south, old squaw, old stager, old story, old style, old style calendar, old style font, old testament, old timer, old times, old witch grass, old witchgrass, old wives' tale, old woman, old world, old world beaver, old world buffalo, old world chat, old world coot, old world coral snake, old world crayfish, old world flycatcher, old world hop hornbeam, old world jay, old world least weasel, old world leishmaniasis, old world mistletoe, old world monkey, old world oriole, old world porcupine, old world quail, old world rabbit, old world robin, old world scops owl, old world vulture, old world warbler, old world white pelican, old world yew, per year, platonic year, sabbatical year, school year, sidereal year, solar year, three year old, time of year, tropical year, two, two bits, two dollar bill, two dozen, two faced, two hundred, two iron, two kettle, two ply, two shakes, two sided, two time, two timer, two times, two weeks, year, year 2000 bug, year 2000 compliant, year 2000 problem, year dot, year of grace