Etymology
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Words related to focus

refocus (v.)

also re-focus, "to focus again or anew," 1858, from re- "back, again" + focus (v.). Related: Refocused; refocusing.

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auto-focus (n.)

by 1933 in photography, originally of enlargers, by 1942 of lenses, from auto- + focus (n.).

curfew (n.)

early 14c., curfeu, "evening signal, ringing of a bell at a fixed hour" as a signal to extinguish fires and lights, from Anglo-French coeverfu (late 13c.), from Old French cuevrefeu, literally "cover fire" (Modern French couvre-feu), from cuevre, imperative of covrir "to cover" (see cover (v.)) + feu "fire" (see focus (n.)). Related: Curfew-bell (early 14c.).

The medieval practice of ringing a bell (usually at 8 or 9 p.m.) as an order to bank the hearths and prepare for sleep was to prevent conflagrations from untended fires. The modern extended sense of "periodic restriction of movement" had evolved by 1800s.

focaccia (n.)
by 1994, from Italian focaccia, from Late Latin focacia, fem. of focacius, used of breads baked under the ashes, from Latin focus "hearth, fireplace" (see focus (n.)). Cognate with Spanish hogaza, Old French foace "griddle cake" (Modern French fouasse "a cake, bun"), Provençal fogassa.
focal (adj.)
"of or pertaining to a focus," 1690s, from Modern Latin focalis; see focus (n.) + -al (1).
foci (n.)
classically correct plural of focus (n.).
foyer (n.)
"lobby of a theater or opera house," 1859, from French foyer "green room, room for actors when not on stage," literally "fireplace," from Old French foier "furnace, stove, hearth, fireplace" (12c.), from Latin focarium, noun use of neuter of adjective focarius "having to do with the hearth," from focus "hearth, fireplace" (see focus (n.)).
fuel (n.)
c. 1200, feuel, feul "fuel, material for burning," also figurative, from Old French foaille "fuel for heating," from Medieval Latin legal term focalia "right to demand material for making fire, right of cutting fuel," from classical Latin focalia "brushwood for fuel," from neuter plural of Latin focalis "pertaining to a hearth," from focus "hearth, fireplace" (see focus (n.)). Figurative use from 1570s. Of food, as fuel for the body, 1876. As "combustible liquid for an internal combustion engine" from 1886. A French derivative is fouailler "woodyard." Fuel-oil is from 1882.
fusilier (n.)
also fusileer, 1670s, "soldier armed with a musket," from French fusilier "musket" (17c.), literally "piece of steel against which a flint strikes flame," from Old French fuisil, foisil "steel for striking fire; flint; whetstone; grindstone" (12c.), from Vulgar Latin *focilis (petra) "(stone) producing fire," from Latin focus "hearth," in Vulgar Latin "fire" (see focus (n.)). Retained by certain regiments of the British army that were formerly armed with fusils.
pho (n.)

type of Vietnamese soup, probably from French feu "fire" (see focus (n.)) "as in pot-au-feu, a stew of meat and vegetables of which the broth is drunk separately as a soup" [Ayto, "Diner's Dictionary"] which would have been acquired in Vietnamese during the French colonial period.