1858, in the meaning defined above
probably from New Latin *extrorsus, from Late Latin, adverb, outward, from Latin extra- + -orsus (as in introrsus) — more at introrse
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“Extrorse.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/extrorse. Accessed 3 Aug. 2021.
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