1832, in botany, of a leaf, "folded back upon itself; folded so as to form a groove," from Latin replicatus, past participle of replicare "to fold back, fold over" (see replicate (v.)).
late 14c., used in Revelation ix.11 of "the angel of the bottomless pit," and by Milton of the pit itself, from Hebrew Abhaddon, literally "destruction," from abhadh "he perished." The Greek form was Apollyon.
central nervous system stimulant, a proprietary name (Ciba Ltd., originally in Switzerland) for the drug methylphenidate hydrochloride. It was trademarked 1948, years before the drug itself was marketed.
the hypothetical reconstructed ancestral language of the Indo-European family, by 1905. The time scale of the "language" itself is much debated, but a recent date proposed for it is about 5,500 years ago.