In the process of notching or indenting; describing the action of creating emarginations or the state of becoming emarginated.
Present participle of emarginate. Used both as a verb form (describing ongoing action) and as an adjective (describing something in the process of becoming notched).
Imagine a plant's leaf developing its characteristic notches as it grows—that dynamic process is what 'emarginating' captures, though again, you won't hear botanists say this often when they have the simpler 'emarginated' form ready.
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