different between pethidine vs morpheridine

English

Blend of p(iper)idine +? eth(yl).

pethidine (countable and uncountable, plural pethidines)

(pharmacology) A synthetic compound used as a painkilling drug, especially for women in labor.
- 2000, JG Ballard, Super-Cannes, Fourth Estate 2011, p. 125:
  Inside was a clutter of prescription pads and a carton containing a collection of diamorphine syrettes and a dozen ampoules of pethidine.

“pethidine”, in Lexico, Dictionary.com; Oxford University Press, 2019–present.
“pethidine”, in Merriam–Webster Online Dictionary, (Please provide a date or year).

From morph(olinyl) +? -eridine (“pethidine derivative”).

morpheridine (uncountable)

(pharmacology) A strong analgesic, a 4-phenylpiperidine derivative related to pethidine.

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