Plural of bothrium; groove-like or sucker-like structures found on parasitic worms, especially tapeworms, used for attachment to host tissues.
From Greek 'bothros' meaning pit or groove, converted to Latin plural form 'bothria'; the term was adopted into biological and parasitological terminology in the 19th century.
Tapeworms have these creepy groove-like suckers called bothria that they use to grip the intestines of their hosts—scientists named them using the Greek word for 'pits,' which is exactly what they look like!
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