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eclipse [eclipse 词源字典]: eclipse: [13] From the point of view of the observer, an object which has been eclipsed has ‘gone away’ – is no longer there. And that in fact is the etymological foundation of the word. It comes, via Old French and Latin, from Greek ékleipsis, a derivative of ekleípein ‘no longer appear or be present’. This was a compound verb formed from the prefix ek- ‘out, away’ and leípein ‘leave’ (a distant relative of English leave).

Its adjectival derivative, ekleiptikós, passed into English as ecliptic [14], which was applied to the apparent path of the Sun relative to the stars because that is the line along which eclipses caused by the moon occur.
=> leave[eclipse etymology, eclipse origin, 英语词源]
ellipse: ellipse: [18] Greek élleipsis meant literally ‘defect, failure’. It was a derivative of elleípein, literally ‘leave in’, hence ‘leave behind, leave out, fall short, fail’, a compound verb formed from the prefix en- ‘in’ and leípein ‘leave’ (which is related to English loan and relinquish). It was borrowed into English in the 17th century as ellipsis in the grammatical sense ‘omission of a word or words’, but its mathematical use for an ‘oval’ (enshrined in the form ellipse, borrowed via French ellipse and Latin ellīpsis) comes from the notion that a square drawn on lines passing vertically and laterally through the centre of an ellipse ‘falls short’ of the entire length of the lateral line.
=> loan, relinquish
eclipse (n.): c. 1300, from Old French eclipse "eclipse, darkness" (12c.), from Latin eclipsis, from Greek ekleipsis "an eclipse; an abandonment," literally "a failing, forsaking," from ekleipein "to forsake a usual place, fail to appear, be eclipsed," from ek "out" (see ex-) + leipein "to leave" (cognate with Latin linquere; see relinquish).
eclipse (v.): late 13c., "to cause an eclipse of," from Old French eclipser, from eclipse (see eclipse (n.)).Figurative use from 1570s. Also in Middle English in an intransitive sense "to suffer an eclipse," now obsolete. Related: Eclipsed; eclipsing.
ellipse (n.): 1753, from French ellipse (17c.), from Latin ellipsis "ellipse," also, "a falling short, deficit," from Greek elleipsis (see ellipsis). So called because the conic section of the cutting plane makes a smaller angle with the base than does the side of the cone, hence, a "falling short." The Greek word was first applied by Apollonius of Perga (3c. B.C.E.). to the curve which previously had been called the section of the acute-angled cone, but the word earlier had been technically applied to a rectangle one of whose sides coincides with a part of a given line (Euclid, VI. 27).
ellipsis (n.): 1560s, "an ellipse," from Latin ellipsis, from Greek elleipsis "a falling short, defect, ellipse in grammar," noun of action from elleipein "to fall short, leave out," from en- "in" (see en- (1)) + leipein "to leave" (see relinquish). Grammatical sense in English first recorded 1610s. Related: Elipticity.
ellipsoid (n.): 1721; see ellipse + -oid. From 1861 as an adjective (earlier adjective was ellipsoidal, 1831).
lipstick (n.): 1880, from lip (n.) + stick (n.).
paralipsis (n.): 1580s, from Greek paraleipsis "passing by omission," from paraleipein "to leave on one side, pass over, leave untold," from para- "beside" (see para- (1)) + leipein "to leave" (see relinquish).
Phillips: proper name of a cross-slot screw and corresponding screwdriver, 1935, named for its inventor, U.S. businessman Henry F. Phillips (1890-1958) of Portland, Ore. It was designed for car makers, hence the handyman's complaint that they are difficult to un-screw. Phillips lost the patent in 1949.
slipshod (adj.): 1570s, "wearing slippers or loose shoes," from slip (v.) + shod "wearing shoes." Sense of "slovenly, careless" is from 1815, probably from the notion of appearing like one in slippers, or whose shoes are down at the heels.
slipstream (n.): also slip-stream, 1913, from slip (n.2) + stream (n.).
solipsism (n.): 1871, coined from Latin solus "alone" (see sole (adj.)) + ipse "self." The view or theory that self is the only object of real knowledge or the only thing that is real. "The identification of one's self with the Absolute is not generally intended, but the denial of there being really anybody else" [Century Dictionary].
solipsistic (adj.): 1882, from solipsism + -istic. Related: Solipsist; solipsistically.