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bi|po|lar /ba I poʊ lə ^r / ADJ [usu ADJ n] Bipolar systems or situations are dominated by two strong and opposing opinions or elements. [FORMAL ] □  …the bipolar world of the Cold War years.

bi|po |lar dis|o r|der (bipolar disorders ) N‑VAR Bipolar disorder is a mental illness in which a person's state of mind changes between extreme happiness and extreme depression.

birch /bɜː ^r tʃ/ (birches ) N‑VAR A birch or a birch tree is a type of tall tree with thin branches.

bird ◆◆◇ /bɜː ^r d/ (birds )

1 N‑COUNT A bird is a creature with feathers and wings. Female birds lay eggs. Most birds can fly.

2 N‑COUNT Some men refer to young women as birds . This use could cause offence. [BRIT , INFORMAL ]

3 → see also early bird , game bird

4 PHRASE If you refer to two people as birds of a feather , you mean that they have the same interests or are very similar.

5 PHRASE A bird in the hand is something that you already have and do not want to risk losing by trying to get something else.

6 PHRASE If you say that a little bird told you about something, you mean that someone has told you about it, but you do not want to say who it was.

7 PHRASE If you say that doing something will kill two birds with one stone , you mean that it will enable you to achieve two things that you want to achieve, rather than just one.

bird|cage /bɜː ^r dke I dʒ/ (birdcages ) also bird cage N‑COUNT A birdcage is a cage in which birds are kept.

bi rd flu N‑UNCOUNT Bird flu is a virus which can be transmitted from chickens, ducks, and other birds to people.

birdie /bɜː ^r di/ (birdies , birdying , birdied )

1 N‑COUNT In golf, if you get a birdie , you get the golf ball into a hole in one stroke fewer than the number of strokes which has been set as the standard for a good player.

2 VERB If a golfer birdies a hole, he or she gets a birdie at that hole. □ [V n] He birdied five of the first seven holes.

bird|life /bɜː ^r dla I f/ also bird life N‑UNCOUNT The birdlife in a place is all the birds that live there.

bird|like /bɜː ^r dla I k/ also bird-like ADJ If someone has a birdlike manner, they move or look like a bird. □  …the birdlike way she darted about.

bi rd of pa ra|dise (birds of paradise ) N‑COUNT A bird of paradise is a songbird which is found mainly in New Guinea. The male birds have very brightly coloured feathers.

bi rd of pa s|sage (birds of passage ) N‑COUNT If you refer to someone as a bird of passage , you mean that they are staying in a place for a short time before going to another place. □  Most of these emigrants were birds of passage who returned to Spain after a relatively short stay.

bi rd of pre y (birds of prey ) N‑COUNT A bird of prey is a bird such as an eagle or a hawk that kills and eats other birds and animals.

bi rd's eye vie w (bird's eye views ) N‑COUNT [usu sing] You say that you have a bird's eye view of a place when you are looking down at it from a great height, so that you can see a long way but everything looks very small.

bird|song /bɜː ^r dsɒŋ, [AM ] -sɔːŋ/ (birdsongs ) also bird song N‑UNCOUNT Birdsong is the sound of a bird or birds calling in a way which sounds musical. □  The air is filled with birdsong.

bi rd ta|ble (bird tables ) N‑COUNT A bird table is a small wooden platform on a pole which some people put in their garden in order to put food for the birds on it.

bi rd-watcher (bird-watchers ) also birdwatcher N‑COUNT A bird-watcher is a person whose hobby is watching and studying wild birds in their natural surroundings.

bi rd-watching also birdwatching N‑UNCOUNT Bird-watching is the activity of watching and studying wild birds in their natural surroundings.

Biro /ba I roʊ/ (Biros ) N‑COUNT A Biro is a pen with a small metal ball at its tip which transfers the ink onto the paper. [BRIT , TRADEMARK ]

birth ◆◇◇ /bɜː ^r θ/ (births )