In a manner relating to or situated on the outside; externally or outwardly.
From ectal (Greek ektos 'outside' + -al) + -ly adverb suffix. Forms an adverb describing directional or positional manner in anatomical contexts.
This word is so technical and rarely used that you might encounter it only in specialized medical writing—it's the adverbial form of ectal, making it one of those multi-layered technical words that builds meaning like stacking blocks.
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