Etymology
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Words related to *werg-

allergic (adj.)

"having an allergy (to something)," 1911, from allergy (q.v.) + -ic; perhaps modeled on French allergique (1906). The figurative use, "antipathetic, repulsed" is by 1936.

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allergy (n.)

"condition caused by hypersensitivity of the immune system to typically harmless substances," 1911, from German Allergie, coined 1906 by Austrian pediatrician Clemens E. von Pirquet (1874-1929) as an abstract noun from Greek allos "other, different, strange" (from PIE root *al- (1) "beyond") + ergon "work, activity" (from PIE root *werg- "to do").

argon (n.)
chemical element, 1894, Modern Latin, from Greek argon, neuter of argos "lazy, idle, not working the ground, living without labor," from a- "without" (see a- (3)) + ergon "work," from PIE root *werg- "to do." So called by its discoverers, Baron Rayleigh and Sir William Ramsay, for its inert qualities. They described it as "most astonishingly indifferent."
boulevard (n.)
1769, "broad street or promenade planted with rows of trees," from French boulevard, originally "top surface of a military rampart" (15c.), from a garbled attempt to adopt Middle Dutch bolwerc "wall of a fortification" (see bulwark) into French, which at that time lacked a -w- in its alphabet.

The notion is of a promenade laid out atop demolished city walls, a way which would be much wider than urban streets. Originally in English with conscious echoes of Paris; in U.S., since 1929, used of multi-lane limited-access urban highways. Early French attempts to digest the Dutch word also include boloart, boulever, boloirque, bollvercq.
bulwark (n.)
early 15c., "a fortification outside a city wall or gate; a rampart, barricade," from Middle Dutch bulwerke or Middle High German bolwerc, probably [Skeat] from bole "plank, tree trunk" (from Proto-Germanic *bul-, from PIE root *bhel- (2) "to blow, swell") + werc "work" (see work (n.)). Thus "bole-work," a construction of logs. Figurative sense "means of defense or security" is from mid-15c. A doublet of boulevard.
cholinergic (adj.)

1934, from choline, name of a basic substance abundant in bile (coined in German, 1862, from Greek khole "bile;" see cholera) + Greek ergon "work" (from PIE root *werg- "to do") + -ic.

demiurge (n.)

1670s, from Latinized form of Greek dēmiourgos, literally "public or skilled worker, worker for the people," from dēmos "common people" (see demotic) + -ergos "that works," from ergon "work" (from PIE root *werg- "to do").

The title of a magistrate in some Peloponnesian city-states and the Achæan League; taken in Platonic philosophy as a name for the maker of the world. In the Gnostic system, "conceived as a being subordinate to the Supreme Being, and sometimes as the author of evil" [OED]. Related: Demiurgic; demiurgical (c. 1600); demiurgeous.

dramaturge (n.)

"dramatist, writer of plays," 1849, from French dramaturge (1775), usually in a slighting sense, from Greek dramatourgos "a dramatist," from drama (genitive dramatos; see drama) + ergos "worker," from PIE root *werg- "to do." Related: Dramaturgic (1831).

energy (n.)

1590s, "force of expression," from French énergie (16c.), from Late Latin energia, from Greek energeia "activity, action, operation," from energos "active, working," from en "at" (see en- (2)) + -ergos "that works," from ergon "work, that which is wrought; business; action" (from PIE root *werg- "to do").

Used by Aristotle with a sense of "actuality, reality, existence" (opposed to "potential") but this was misunderstood in Late Latin and afterward as "force of expression," as the power which calls up realistic mental pictures. Broader meaning of "power" in English is first recorded 1660s. Scientific use is from 1807. Energy crisis first attested 1970.

erg (n.1)

unit of energy in the C.G.S. system, coined 1873 by the British Association for the Advancement of Science, from Greek ergon "work" (from PIE root *werg- "to do").