Resembling or having the characteristics of endothelial tissue; appearing like endothelium under a microscope.
From endothelial + -oid (Greek 'resembling'). Pathology term for describing tissue that looks similar to endothelium.
Pathologists use 'endothelioid' to describe tumors that look like blood vessel linings but aren't—it's a diagnostic clue that helps them figure out what rare cancer they're dealing with!
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