Describing a leaf or other plant structure that has veins arranged in a radial pattern, spreading outward from a central point like spokes on a wheel.
From actinodrome + -ous (Latin suffix meaning 'full of' or 'characterized by'). This botanical adjective became standard terminology in the 19th century for classifying leaf vein patterns.
Actinodromous leaves are a botanical superpower—plants with this vein pattern like geraniums and hibiscus can handle being eaten or torn from multiple directions because their veins originate from one central point, so damage to one 'spoke' doesn't cut off the whole leaf.
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