English Words Starting With N

• nicotiana

  nounRare
  /nɪˌkəʊʃɪˈɑːnə/A genus of flowering plants in the nightshade family, which includes the tobacco plant.
• nicotinamide

  nounC2/Technical
  /ˌnɪkəˈtɪnəmaɪd/A form of vitamin B3 (niacin) that is essential for metabolism and cellular function.
• nicotinamide adenine dinucleotide

  nounC2
  /ˌnɪkətiːnəmaɪd ˈædəniːn daɪˈnjuːkliətaɪd/A coenzyme found in all living cells, essential for cellular energy production and metabolism.
• nicotinamide adenine dinucleotide phosphate

  nounVery low frequency (C2/technical specialist)
  /ˌnɪkəˌtɪnəmaɪd ˈædəniːn daɪˌnjuːkliətaɪd ˈfɒsfeɪt/A coenzyme essential for anabolic reactions that require reducing power, including lipid and nucleic acid synthesis, primarily in its reduced form (NADPH).
• nicotine

  nounC1
  /ˈnɪk.ə.tiːn/A toxic, addictive alkaloid found in tobacco plants.
• nicotinic acid

  nounC2
  /ˌnɪkəˈtɪnɪk ˈæsɪd/A water-soluble vitamin of the B complex, essential for cell metabolism and energy production.
• nicotinism

  nounRare
  /ˈnɪk.ə.tiː.nɪ.zəm/A pathological condition caused by excessive use of tobacco, specifically nicotine poisoning.
• nicotinize

  verb-transitiveC2+
  /ˈnɪk.ə.tiː.naɪz/To treat with nicotine or to expose to nicotine.
• nicoya

  nounLow
  /nɪˈkɔɪ.ə/A toponym referring to the Nicoya Peninsula, a region in northwestern Costa Rica, and its adjacent Gulf.
• nicoya peninsula

  nounLow
  /nɪˈkɔɪ.ə pəˈnɪn.sjə.lə/A geographical region and peninsula located on the Pacific coast of northwestern Costa Rica.
• nictate

  verb-intransitiveVery Rare / Archaic / Literary
  /nɪkˈteɪt/to blink or close and open the eyelids rapidly.
• nictheroy

  nounExtremely Rare / Archaic / Literary
  An archaic or rare term for the chirping or singing of birds at night.
• nictitate

  verbverb-intransitiveRare / Technical
  /ˈnɪk.tɪ.teɪt/To wink or blink, especially involuntarily or rapidly.
• nictitating membrane

  nounC2
  /ˈnɪk.tɪ.teɪ.tɪŋ ˈmem.breɪn/A thin, translucent, protective membrane that can be drawn across the eye in some vertebrate animals.
• nicu

  abbreviationnounC1
  /ˈnɪk.juː/ or /ˈnaɪ.kjuː/Neonatal Intensive Care Unit; a specialized hospital unit providing intensive medical care for premature or critically ill newborn infants.
• nid-nod

  verbRare
  /ˈnɪdˌnɒd/A nodding movement of the head, typically indicating drowsiness or agreement.
• nida

  nounvery_rare
  /ˈnɪdə/ or /ˈnaɪdə/A rare or obsolete term meaning need, want, or distress.
• nidana

  nounC2 (Highly specialized/technical)
  /nɪˈdɑːnə/A cause, origin, or root condition; particularly (in Buddhism) one of the twelve links in the chain of dependent origination explaining the cycle of rebirth and suffering.
• nidaros

  nounLow
  /ˈniːdərɒs/The former medieval name for the city of Trondheim, Norway.
• nidation

  nounRare
  /nʌɪˈdeɪʃ(ə)n/The implantation of a fertilized ovum in the lining of the uterus.

Showing 1781–1800 of 3475 words.