Sitting near or adjacent to something; positioned closely beside or next to.
From Latin assidens, present participle of assidere (ad- 'to' + sedere 'to sit'). The root literally means 'sitting at or beside.'
This word perfectly captures the Latin root—it's not just near, it's specifically about sitting beside something, which is why you'll find it in anatomy to describe things positioned right next to other parts.
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