Plural form of exostra; multiple external rostrums or beak-like projections.
Latin plural of exostra, following classical Latin pluralization patterns (-a ending for neuter nouns). Used in historical zoological and anatomical descriptions from the Linnaean era onward.
This word represents linguistic archaeology—it's a Latin plural form from centuries of scientific Latin that modern biologists would simply say 'external rostrums' instead of, because English plurals are simpler.
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