In a manner relating to plants or plant science; from the perspective of botany.
From 'botanic' plus the adverbial suffix '-ally.' This is the straightforward adverbial form allowing botanical concepts to be applied as modifiers to other words.
When scientists say something is 'botanically speaking,' they're using their plant-expert glasses to look at a problem. For instance, a tomato is botanically a fruit (because it develops from a flower), even though we call it a vegetable in cooking!
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