In botany, another name for the exine; the outer wall layer of a pollen grain.
A variant or alternative form of exine using the suffix -tine (indicating a substance or layer). This term is less common but appears in older botanical texts as a synonymous designation.
Some scientists used exintine as a more descriptive term to emphasize it's the 'outer part' (ex-) of the pollen's inner structure (-tine), though exine eventually became the standard term—a great example of how scientific vocabulary gets standardized!
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