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noun, Astronomy.
the duration of a complete rotation of the Milky Way, approximately 200 million years.


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  • Galactin

    [guh-lak-tin] /gəˈlæk tɪn/ noun, Biochemistry. 1. .

  • Galacto-

    1. a combining form meaning “milk,” used in the formation of compound words: galactopoietic. combining form 1. milk or milky: galactometer galacto- or galact- pref. Milk: galactotherapy.

  • Galactobolic

    galactobolic ga·lac·to·bol·ic (gə-lāk’tə-bŏl’ĭk) adj. Causing the release or ejection of milk from the breast.

  • Galactocele

    galactocele ga·lac·to·cele (gə-lāk’tə-sēl’) n. A retention cyst that results from occlusion of a lactiferous duct. Also called lactocele.

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