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| thy·la·koid [ thlə kòyd ] (plural thy·la·koids) |
noun |
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| Definition: |
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sac in which photosynthesis takes place: any of a group of chlorophyll-containing membranous structures resembling sacs in which photosynthesis takes place. Thylakoids are stacked one on top of the other in the chloroplast layers grana of most plants.
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| [Mid-20th century. < Greek thulakos "sac"] |
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