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.
bone knob on either side of the human ankle, 1690s, from Latin malleolus, diminutive of malleus "a hammer" (from PIE root *mele- "to crush, grind"). Anatomical use is said to date to Andreas Vesalius (1514-1564). Related: Malleolar.