Yours, Etc.: Origins and Uses of 8 Sign-Offs
introduced 1955 as the name of an elixir for children, trade name originally registered by McNeil Laboratories, Philadelphia, Pa., from elements abstracted from N-acetyl-para-aminophenol, the chemical name of its active compound.
Tylenol Ty·le·nol (tī'lə-nôl')
A trademark used for a brand of acetaminophen.