WordNet

sway gently back and forth, as in a nodding motion; "the flowers were nodding in the breeze"
be almost asleep; "The old man sat nodding by the fireplace"
let the head fall forward through drowsiness; "The old man was nodding in his chair"
the act of nodding the head
a sign of assent or salutation or command
express or signify by nodding; "He nodded his approval"
lower and raise the head, as to indicate assent or agreement or confirmation; "The teacher nodded when the student gave the right answer"
any thickened enlargement (同)knob, thickening
(botany) the small swelling that is the part of a plant stem from which one or more leaves emerge (同)leaf node
a connecting point at which several lines come together
(computer science) any computer that is hooked up to a computer network (同)client, guest
(astronomy) a point where an orbit crosses a plane
(physics) the point of minimum displacement in a periodic system
any bulge or swelling of an anatomical structure or part

PrepTutorEJDIC

(承諾・あいさつ・合図などで)『うなずく』,会釈する / (眠くて)『こっくりする』,(油断して)うとうとする《+off》 / 〈草木・穂などが〉揺れる / (承諾・あいさつなどで)〈頭〉‘を'『うなずかせる』 / …‘を'うなずいて示す / 《副詞[句]を伴って》〈人〉‘に'うなずいて示す / 《同意・承諾・あいさつ・命令など,また時には拒絶を表して》(…に対する)『うなずき』,『会釈』《+『to』+『名』》;(眠気による)こっくり
(茎・幹の)節(ふし) / (体組織にできた)結節,こぶ(リンパ瘤(りゅう)など) / (天体の軌道の)交点 / (物事の)中心点

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Tada S, Kino M, Yamamoto W, Harada J, Kanehira C.
Clinical radiology.Clin Radiol.1977 Nov;28(6):659-62.
Contrast nasopharyngography was performed in 25 cases of nasopharyngeal lesions, 15 of which were carcinoma, six malignant lymphoma, and four benign lesions including neurofibroma, haemangioma, angiofibroma and tuberculosis. Nasopharyngography was also performed in 22 cases with extranasopharyngeal
PMID 589923