hair
UK: hɛə | US: hɛr
n. a thread-like strand growing from the skin of mammals, especially on the human head
n. a mass of such strands collectively (e.g., "She has long hair")
n. a similar filamentous structure on plants or insects (e.g., "leaf hairs")
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The word "hair" traces back to Old English hǣr, derived from Proto-Germanic hērą, meaning "hair." This term is shared across Germanic languages (e.g., Old Norse hár, Dutch haar). Its Proto-Indo-European root ker(s)- also gave rise to Latin capillus (hair) and Greek kárē (head), though the modern English spelling and form remain distinctly Germanic. As a core noun with ancient roots, "hair" retains a simple, unbroken structure.
She brushed her long hair before tying it into a ponytail.
The cat left white hairs all over the black sofa.
Plant hairs help protect leaves from insects.
His hair turned gray as he grew older.
A single hair was stuck in the drain.