The Prose Edda 2.69

"A man's head is termed thus: [thus should it he periphrased: call it Toil or Burden of the Neck; Land of the Helm, of the Hood, and of the Brain, of the Hair and Brows, of the Scalp, of Ears, Eves, and Mouth; Sword of Heimdallr, arid it is correct to name any term for sword which one desires; and to periphrase it in terms of every one of the names of Heimdallr] the Head, in simple terms, is called Skull, Brain, Temple, Crown. The eyes are termed Vision or Glance, and Regard, Swift-Appraising; [they may be so periphrased as to call them Sun or Moon, Shields and Glass or Jewels or Stones of the Eyelids, of the Brows, the Lashes, or the Forehead]. The ears are called Listeners or Hearing; [one should periphrase them by calling them Land, or any earth-name, or Mouth, or Canal, or Vision, or Eyes of Hearing, if the metaphors employed are new-coined. The mouth one should periphrase by calling it Land or House of the Tongue or of the Teeth, of Words or of the Palate, of the Lips, or the like; and if the metaphors used are not traditional, then men may call the mouth Ship, and the lips the Planks, and the tongue Oar or Tiller of the Ship. The teeth are sometimes called Gravel or Rocks of Words, of the Mouth, or of the Tongue. The tongue is often called Sword of Speech or of the Mouth]. The hair which stands on the lips is called Beard, Moustache, or Whiskers. Hair is called Nap; the hair of women is called Tresses. Hair is termed Locks. [One may periphrase hair by calling it Forest, or by some tree-name; one may periphrase it in terms of the skull or brain or head; and the beard in terms of chin or cheeks or throat.]