| nod | (noun) the act of nodding the head | - |
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| (noun) a sign of assent or salutation or command | - |
| noddle | (noun) an informal British expression for head or mind | - |
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| node | (noun) (computer science) any computer that is hooked up to a computer network | Synonyms: client, guest |
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| (noun) any bulge or swelling of an anatomical structure or part | - |
| (noun) the source of lymph and lymphocytes | Synonyms: lymph gland, lymph node |
| (noun) (astronomy) a point where an orbit crosses a plane | - |
| (noun) (physics) the point of minimum displacement in a periodic system | - |
| (noun) (botany) the small swelling that is the part of a plant stem from which one or more leaves emerge | Synonyms: leaf node |
| (noun) any thickened enlargement | Synonyms: knob, thickening |
| (noun) a connecting point at which several lines come together | - |
| nodule | (noun) a small node | - |
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| (noun) (mineralogy) a small rounded lump of mineral substance (usually harder than the surrounding rock or sediment) | - |
| (noun) small rounded wartlike protuberance on a plant | Synonyms: tubercle |