/bɜːrd/
[noun] A warm-blooded animal with feathers, wings, and a beak that usually has the ability to fly. The word is also used informally to refer to a person, especially in British English.
The Old English word for bird was actually 'fugol' — 'bird' originally meant only a baby animal, like a chick.
It is one of the quiet surprises of the English language that the word we use every day for one of nature's most visible creatures was not, for most of Old English history, the word for a bird at all. The dominant Old English word was 'fugol' — a word related to modern German 'Vogel' and Dutch 'vogel', both still meaning bird — and it was 'fugol' that gave us the modern word 'fowl'. 'Bird' itself, spelled 'bridd' in Old English, referred specifically to a young bird, a nestling or chick. It was a word for new life, for something small and vulnerable, not for the soaring creatures we picture today.
The journey from 'bridd' to 'bird' is one of the most fascinating little accidents in English phonology. The original form had the letters in the order b-r-i-d-d, but somewhere in the Middle English period, English speakers began swapping the 'r' and the vowel around, a process linguists call metathesis. This same process turned Old English 'thridda' into 'third', and 'hros' into 'horse'. Nobody decided to make these changes — they happened naturally, the way spoken language always drifts and reshapes itself across generations of mouths and ears.
By the 13th and 14th centuries, 'bird' in its modern spelling and pronunciation was appearing in texts, and its meaning had begun to expand. No longer confined to baby birds, it had started to absorb the role of the fading 'fugol', taking on the general sense of any feathered creature. 'Fowl' survived too, but it gradually narrowed to refer mainly to domesticated birds kept for food — chickens, geese, turkeys — while 'bird' claimed the wider, wilder kingdom of all feathered things.
The word's deeper prehistoric roots are genuinely mysterious. Linguists have not been able to trace 'bridd' to any reliable Proto-Germanic or Proto-Indo-European ancestor with confidence. Unlike most common English words, it does not have convincing cousins in Latin, Greek, or the Scandinavian languages. Some scholars believe it may be a very old, isolated native word; others suspect it is simply too small and ancient for its trail to survive. This makes 'bird' something of an orphan word — one of the everyday words whose origin disappears into the deep silence before written history.
In informal British English, 'bird' also developed the slang meaning of a young woman, which appeared in the 19th century and became very common in 20th-century British speech. This likely developed from an older, more affectionate use of the word for any person, especially one considered young or lively, echoing the way many languages use small or gentle animal names as terms of endearment. The word has also given English the rich compound vocabulary of 'birdsong', 'birdwatcher', 'birdbrain', and the expression 'a little bird told me', which dates back at least to the 16th century and hints at something ancient and half-magical about our feeling for these creatures — as if birds carry secrets between the worlds.