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search [search 词源字典]: search: [14] Etymologically, search denotes ‘going round in a circle’ – for its ultimate source is Latin circus ‘circle’ (source of English circle and circus). From this was derived the verb circāre ‘go round’, which by the time it had reached Old French as cerchier had acquired connotations of ‘examining’ or ‘exploring’. English took it over via Anglo-Norman sercher. (It is no relation, incidentally, to English seek.)
=> circle, circus[search etymology, search origin, 英语词源]
explore (v.): 1580s, "to investigate, examine," a back-formation from exploration, or else from Middle French explorer (16c.), from Latin explorare "investigate, search out, examine, explore," said to be originally a hunters' term meaning "set up a loud cry," from ex- "out" (see ex-) + plorare "to weep, cry." Compare deplore. Second element also is explained as "to make to flow," from pluere "to flow." Meaning "to go to a country or place in quest of discoveries" is first attested 1610s. Related: Explored; exploring.
probe (n.): early 15c., "instrument for exploring wounds, etc.," also "an examination," from Medieval Latin proba "examination," in Late Latin "a test, proof," from Latin probare (see prove). Meaning "act of probing" is 1890, from the verb; figurative sense of "penetrating investigation" is from 1903. Meaning "small, unmanned exploratory craft" is attested from 1953.
sub-aqua: "Relating to swimming or exploring under water, especially with an aqualung", 1950s: from sub- 'under' + Latin aqua 'water'.