DICT.TW Dictionary Taiwan

 si·nus /ˈsaɪnəs/
 竇,靜脈竇,灣,下陷或凹下去的地方

 si·nus /ˈsaɪnəs/ 名詞
 (複sinuses or sinus)竇(解剖),竇道(膿液流出的管道),凹,中槽(腕足類),彎(軟體動物),彎缺(葉緣),竇,竇道,竇房結

 Si·nus n.; pl. L. Sinus, E. Sinuses
 1. An opening; a hollow; a bending.
 2. A bay of the sea; a recess in the shore.
 3. Anat. & Zool. A cavity; a depression. Specifically: (a) A cavity in a bone or other part, either closed or with a narrow opening. (b) A dilated vessel or canal.
 4. Med. A narrow, elongated cavity, in which pus is collected; an elongated abscess with only a small orifice.
 5. Bot. A depression between adjoining lobes.
 Note: ☞ A sinus may be rounded, as in the leaf of the white oak, or acute, as in that of the red maple.
 Pallial sinus. Zool. See under Pallial.
 Sinus venosus [L., venous dilatation.] Anat. (a) The main part of the cavity of the right auricle of the heart in the higher vertebrates. (b) In the lower vertebrates, a distinct chamber of the heart formed by the union of the large systematic veins and opening into the auricle.
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 sinus
      n 1: an abnormal passage leading from a suppurating cavity to the
           body surface [syn: fistula]
      2: any of various air-filled cavities especially in the bones
         of the skull
      3: a wide channel containing blood; does not have the coating
         of an ordinary blood vessel [syn: venous sinus]