Definition of ray flower
1
: one of the marginal flowers of the head in a composite plant (such as the aster) that also has disk flowers
2
: the entire head in a plant (such as chicory) that lacks disk flowers
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“Ray flower.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ray%20flower. Accessed 13 Apr. 2021.
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The first known use of ray flower was in 1839
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