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Calyx (noun)
The outermost whorl of flower parts, comprising the sepals, which covers and protects the petals as they develop.
“sepal”
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Calyx (noun)
Any of various cup-like structures.
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Calyx (noun)
A chamber in the mammalian kidney through which urine passes.
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Calyx (noun)
The crown containing the viscera of crinoids and similar echinoderms, entoprocts, and the polyps of some cnidarians.
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Calyx (noun)
A funnel-shaped expansion of the vas deferens or oviduct of insects.
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Corolla (noun)
An outermost-but-one whorl of a flower, composed of petals, when it is not the same in appearance as the outermost whorl (the calyx); it usually comprises the petal, which may be fused.
Wiktionary