In a manner resembling a spearhead or in a hastate fashion; describing how something is shaped or arranged.
Formed from 'hastate' with the adverbial suffix -ly, creating an adverb that describes the manner of something's shape or arrangement.
Hastately is the kind of word that only exists in technical botanical writing—a description of how leaves arrange themselves or how they're shaped. Most English speakers will never use or hear it, but it proves that scientific language keeps evolving to meet descriptive needs.
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