頭髪

(1)a covering for the body (or parts of it) consisting of a dense growth of threadlike structures (as on the human head); helps to prevent heat loss; "he combed his hair"; "each hair consists of layers of dead keratinized cells"

(2)糸状構造物（人間の頭の上で）の高密度増殖からなる体（またはその部分）の覆い

(3)熱の損失を防ぐのを助ける

(1)he combed his hair

(2)彼は髪の毛をとかした

(3)each hair consists of layers of dead keratinized cells

(4)髪は死んでいる角化細胞の層から成る