Having or characterized by a firmly constructed breastbone; an alternative technical term describing rigid sternal anatomy.
From firmisterna with the adjectival suffix '-ous' (from Latin -osus meaning full of), creating a descriptive adjective emphasizing the quality of firmness.
Victorian-era naturalists loved piling on Latin suffixes—'firmisternous' sounds impressively scientific but is rarely used today, showing how scientific language constantly evolves and simplifies.
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