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Like a nucleus in form or appearance. Later (Microbiology): relating to or of the nature of a nucleoid.
Biology. A structure comprising the genetic material of a prokaryotic cell, virus, or cellular organelle.
Mid 19th century; earliest use found in John Ogilvie (1797–1867), lexicographer. From nucleus + -oid. In sense B. 1 after German Nucleoïd.
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