In a biseriate manner; with arrangement in two rows or tiers.
Adverbial form of 'biseriate' with the '-ly' suffix. Created in scientific writing to modify verbs and describe how biological structures arrange themselves.
Scientists needed a word to describe exactly HOW structures grow, so they took 'biseriate' and added '-ly'—it's a small example of how English keeps inventing new adverbs to be more precise.
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