Definitions of nucleus

  1. a part of the cell containing DNA and RNA and responsible for growth and reproduction
  2. a small group of indispensable persons or things; " five periodicals make up the core of their publishing program"
  3. ( astronomy) the center of the head of a comet; consists of small solid particles of ice and frozen gas that vaporizes on approaching the sun to form the coma and tail
  4. any histologically identifiable mass of neural cell bodies in the brain or spinal cord
  5. the positively charged dense center of an atom
  6. The body or the head of a comet.
  7. An incipient ovule of soft cellular tissue.
  8. A whole seed, as contained within the seed coats.
  9. A body, usually spheroidal, in a cell or a protozoan, distinguished from the surrounding protoplasm by a difference in refrangibility and in behavior towards chemical reagents. It is more or less protoplasmic, and consists of a clear fluid ( achromatin) through which extends a network of fibers ( chromatin) in which may be suspended a second rounded body, the nucleolus ( see Nucleoplasm). See Cell division, under Division.
  10. The tip, or earliest part, of a univalve or bivalve shell.
  11. The central part around which additional growths are added, as of an operculum.
  12. A visceral mass, containing the stomach and other organs, in Tunicata and some mollusks.
  13. A kernel; hence, a central mass or point about which matter is gathered, or to which accretion is made; the central or material portion; - used both literally and figuratively.
  14. The kernel; the central part about which matter collects; the small, central mass of life- containing substance, from which plants and animals grow.
  15. The central mass round which matter gathers: ( astr.) the head of a comet:- pl. NUCLEI.
  16. Any central mass; head of a comet.
  17. A center of development; central mass, as of a comet; kernel.
  18. Central part of a body round which the rest accumulates; the body of a comet.
  19. Anything round which matter has accumulated; that which may form the solid foundation or basis, as the nucleus of an army; the solid centre of any nodule or rounded mass; the central fleshy part of an oval; the body of a comet.
  20. A complex spheroidal mass essential to the life of a cell.

Usage examples for nucleus

  1. If we then remove the shell itself, we find within a solid nucleus of clay, having the form of the interior of the shell. – The Student's Elements of Geology by Sir Charles Lyell
  2. Mechanism and finalism agree in taking account only of the bright nucleus shining in the centre. – Creative Evolution by Henri Bergson
  3. In their bargains with the Indians they acquired immense tracts of land in the Northern part of the State of New York, which were the nucleus of their large fortunes. – Eighty Years And More; Reminiscences 1815-1897 by Elizabeth Cady Stanton
  4. It had grown to a membership of 750. It still kept for its nucleus painters, writers, musicians and actors, amateur and professional. – Complete Story of the San Francisco Horror by Richard Linthicum Trumbull White Samuel Fallows
  5. It thus seems a reasonable hypothesis that the nucleus of the Banjara caste was constituted by the Charans or bards of Rajputana. – The Tribes and Castes of the Central Provinces of India Volume II by R. V. Russell
  6. The leading thought or idea can be taken as a nucleus and around it constructed the different parts of the paragraph. – How to Speak and Write Correctly by Joseph Devlin
  7. The vigor of mind and body- our learned youth on one hand and strong- armed peasantry on the other- form the nucleus of our force. – The Complete Historical Romances of Georg Ebers by Georg Ebers
  8. They stand on the site of the earliest nucleus of the present city, and it is in this neighbourhood that one gets most in touch with the Rouen that has so nearly vanished. – Normandy, Complete The Scenery & Romance Of Its Ancient Towns by Gordon Home
  9. The nucleus of a branch exhibition was forming itself in Welbeck Street. – The Crime Doctor by Ernest William Hornung
  10. They formed a nucleus which gave the school a firm position. – Pictures of German Life in the XVIIIth and XIXth Centuries, Vol. II. by Gustav Freytag
  11. Yet they were but a nucleus, while his supplies remained few and poor, and the organization of the army unsatisfactory. – The Siege of Boston by Allen French
  12. The Home is the crystal of society- the nucleus of national character; and from that source, be it pure or tainted, issue the habits, principles and maxims, which govern public as well as private life. – Self Help by Samuel Smiles
  13. Maybe he thinks it's easy to be a nucleus. – Pee-Wee Harris Adrift by Percy Keese Fitzhugh
  14. Now, we want to make more use of this, to make the Salvation Army the nucleus of a great agency for bringing comfort and counsel to those who are at their wits' end, feeling as if in the whole world there was no one to whom they could go. – In-Darkest-England-and-the-Way-Out by Booth, William
  15. This was the nucleus of the fine collection which since 1812 has been included in the Palace of the Doges. – Italy, the Magic Land by Lilian Whiting
  16. All Canada might be taken, with the aid of our French and Indian allies, had we but a nucleus of American soldiers, and sufficient means to forward the enterprise. – Donald McElroy, Scotch Irishman by Willie Walker Caldwell
  17. I confess, then, that the figure of Pepita was, as it were, the center, or rather the nucleus and focus of these idle fancies. – Pepita Ximenez by Juan Valera
  18. It was my own; I had earned it with my own hand; and it seemed to my delighted fancy to form the nucleus out of which a future independence for my family might arise. – Roughing it in the Bush by Susanna Moodie