Relating to or characteristic of gymnosperms, plants with naked or exposed seeds not enclosed in fruit.
From 'gymnosperm' plus the adjective suffix '-al.' This creates the adjectival form used to describe something having the qualities of gymnosperms.
You're basically adding a suffix that means 'having the nature of'—so 'gymnospermal' is just a fancy way of saying 'gymnosperm-like' in scientific writing.
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