"ridge of rock deposited along the edge of a glacier," 1789, from French moraine (18c.), from Savoy dialect morena "mound of earth," from Provençal morre "snout, muzzle," from Vulgar Latin *murrum "round object," a word of unknown origin, perhaps from a pre-Latin Alpine language. Related: Morainal; morainic.
To much amplifying thinges yt. be but small, makyng mountaines of Molehils. [John Foxe, "Acts and Monuments," 1570]
late 14c., peue, "raised, bench-like seat for certain worshipers" (ladies, important men, etc.), frequently enclosed, from Old French puie, puy "balcony, elevated place or seat; elevation, hill, mound," from Latin podia, plural of podium "elevated place," also "front balcony in a Roman theater" (where distinguished persons sat; see podium). Meaning "fixed bench with a back, for a number of worshipers" is attested from 1630s. Related: Pewholder; pew-rent.
Old English dic "trench, ditch; an earthwork with a trench; moat, channel for water made by digging," from Proto-Germanic *dikaz (source also of Old Norse diki "ditch, fishpond," Old Frisian dik "dike, mound, dam," Middle Dutch dijc "mound, dam, pool," Dutch dijk "dam," German Deich "embankment"), from PIE root *dheigw- "to pierce; to fix, fasten." The sense evolution would be "to stick (a spade, etc.) in" the ground, thus, "to dig," thus "a hole or other product of digging."
This is the northern variant of the word that in the south of England yielded ditch (n.). At first "an excavation," later applied to the ridge or bank of earth thrown up in excavating a ditch or canal (late 15c.), a sense development paralleled by the cognate words in many languages, though naturally it occurred earlier in Dutch and Frisian. From 1630s specifically as "ridge or bank of earth to prevent lowlands from being flooded." In geology, "vertical fissure in rocks filled with later material which made its way in while molten" (1835).
OED, however, suggests derivation from root of talus (n.1) in the sense of "heel" which developed in its Romanic descendants. Mainly used of military earthwork at first; meaning "sloping mass of rocky fragments that has fallen from a cliff" is first recorded 1830.
1510s, "gallery, portico, balcony," later "flat, raised place for walking" (1570s), from French terrace (Modern French terasse), from Old French terrasse (12c.) "platform (built on or supported by a mound of earth)," from Vulgar Latin *terracea, fem. of *terraceus "earthen, earthy," from Latin terra "earth, land" (from PIE root *ters- "to dry").
As a natural formation in geology, attested from 1670s. In street names, originally in reference to a row of houses along the top of a slope, but lately applied arbitrarily as a fancy name for an ordinary road. As a verb from 1610s, "to form into a terrace." Related: Terraced.