"small hand-tool, shaped like an awl, used for breaking ice," 1858, from ice (n.) + pick (n.1).

"to glide across a frozen surface on ice-skates," 1690s, from ice (n.) + skate (n.2). The verb usually was skate until the advent of roller-skating mid-18c. made distinction necessary. A run of severe winters that froze over the Thames in the late 17c. made ice-skating popular in England. Related: Ice-skates (1862).

"water from melted ice; water cooled by ice," 1722, from ice (n.) + water (n.1).

1774, "glacier humped like a hill;" 1820 as "detached piece of a glacier or ice pack at sea," partial loan-translation of Dutch ijsberg, literally "ice mountain," from ijs "ice" (see ice (n.)) + berg "mountain" (from PIE root *bhergh- (2) "high," with derivatives referring to hills and hill-forts.). Similar formation in Norwegian isberg, Danish isbjerg.

Earlier English terms were sea-hill (1690s), island of ice (1610s). Phrase tip of the iceberg in a figurative sense (in allusion to most of it being unseen underwater) first recorded 1962. Iceberg lettuce attested from 1893, apparently originally a trade name.

1570s, "weasel-like animal of Egypt," from Latin ichneumon, from Greek ikhneumon "ichneumon," literally "searcher, tracker," perhaps so called because it hunts crocodile eggs, from ikhneuein "hunt for, track," from ikhnos "a track, footstep, trace, clue," which is of unknown origin. Used by Aristotle for a species of wasp that hunts spiders (a sense attested in English from 1650s).

"stone presenting a fossil footprint," 1841, from Latinized form of Greek ikhnos "a track, footprint" (which is of unknown origin) + -lite. Ichnite in the same sense is from 1854. Ichnology, "scientific study of fossil footprints," is from 1837.

So numerous have been the discoveries of fossil footmarks in Europe within a few years past, and so many species occur in this country, that it will be at least convenient to have them designated by some appropriate scientific terms, and to arrange them in systematic order. I propose the term Ichnolite ... to include them all and to be the name of the Class. [Edward Hitchcock, LL.D., "Final Report on the Geology of Massachusetts," 1841]

"the reading of traces of footsteps to determine the nature and peculiarities of what made them," 1855, from Latinized form of Greek ikhnos "a track, footprint" (which is of unknown origin) + -mancy "divination by means of."

"ethereal fluid that serves for blood in the veins of the gods," 1630s, from French ichor (16c.) or Modern Latin ichor, from Greek ikhōr, a word of unknown origin, possibly from a non-Indo-European language. Related: Ichorous.