Question

what do you mean by spleen .
and what do you mean by nucteloid

Answer 1

The spleen is the largest organ in the lymphatic system. It is an important organ for keeping bodily fluids balanced, but it is possible to live without it.

The spleen is located under the ribcage and above the stomach in the left upper quadrant of the abdomen. A spleen is soft and generally looks purple. It is made up of two different types of tissue

The nucleoid is an irregularly shaped region within the cell of a prokaryote that contains all or most of the genetic material, called genophore. In contrast to the nucleus of a eukaryotic cell, it is not surrounded by a nuclear membrane. 
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Answer 2

spleen is an abdominal organ involved in the production and removal of blood cells in most vertebrates and forming part of the immune system.

The nucleoid (meaning nucleus-like) is an irregularly shaped region within the cell of a prokaryotethat contains all or most of the genetic material, called genophore. In contrast to the nucleus of a eukaryotic cell, it is not surrounded by a nuclear membrane. 

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