Middle English tisike, from Anglo-French, from Latin phthisicus suffering from tuberculosis, from Greek phthisikos, from phthisis
14th century, in the meaning defined above
“Phthisic.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/phthisic. Accessed 30 Nov. 2023.
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