a thing constructed; a complex entity constructed of many parts | a part of the cell containing DNA and RNA and responsible for growth and reproduction |
the manner of construction of something and the arrangement of its parts | any histologically identifiable mass of neural cell bodies in the brain or spinal cord |
a particular complex anatomical part of a living thing and its construction and arrangement | the central structure of the lens that is surrounded by the cortex |
the complex composition of knowledge as elements and their combinations | a small group of indispensable persons or things |
the people in a society considered as a system organized by a characteristic pattern of relationships | the positively charged dense center of an atom |
| (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 |