< Greek τρῖψις (trîpsis), 'rubbing' and ϕαίνειν (phaínein), 'to appear'; named for the enzyme trypsin, which was originally produced by rubbing the pancreas with glycerine
< Greek ὄρνις (ornīs), 'bird', because it was isolated from bird urine [related: ornithology]
Latin for 'watermelon'
< Latin citrullus, 'watermelon', because it was first isolated from watermelons
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* Not strictly an amino acid, but often considered to be one in the literature. Where the reason for a name is not known, no explanatory side note is given.
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