Relating to or belonging to an antheridium, the male reproductive organ found in mosses, ferns, and algae.
From 'antheridium' (Greek 'anthos' meaning flower + Latin '-idium' meaning small thing), formed in 19th century botany to describe the structure where male sex cells develop.
Plants invented sex organs long before flowers existed—moss antheridia are ancient proof that reproduction was perfected billions of years ago, just in tiny packages you need a microscope to see.
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