Etymology
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Words related to iso-

equi- 
before vowels equ-, word-forming element meaning "equal, having equal," from Latin aequi-, combining form of aequus "equal, even" (see equal (adj.)).
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aniso- 
word-forming element meaning "unequal, not equal," from Greek anisos "not equal," from an- "not" (see an- (1)) + isos "equal to, the same as" (see iso-).
isobar (n.)

1864, coined from Greek isos "equal" (see iso-) + baros "weight" (from PIE root *gwere- (1) "heavy"). Line connecting places with the same barometric pressure at the same time. Related: Isobaric.

isocephalic (adj.)

"having the heads of the principal figures at about the same level," 1893, from Greek isokephalos "like-headed," from isos "equal" (see iso-) + kephalē "head" (see cephalo-). The rule or principle of ancient Greek art that makes figures standing and on horseback have heads carved on nearly the same level.

isochromatic (adj.)
"having the same color," 1817, from iso- "equal, the same" + stem of chroma + -ic.
isochronous (adj.)
"uniform in time, of equal time, performed in equal times," 1706, with suffix -ous, from Modern Latin isochronus, from Greek isokhronos "equal in age or time," from iso- "equal" (see iso-) + khronos "time" (see chrono-). Earlier in same sense was isochronal (1670s).
isocracy (n.)
"equal power," 1650s, from Greek isokratia "equality of political rights," from isokrates "of equal power, possessing equal rights with (others)," from isos "equal" (see iso-) + -kratia "power, rule, authority" (see -cracy). Related: Isocratic.
isodynamic (adj.)
"having equal power or force," 1827, from iso- "the same, equal" + dynamic (adj.).
isogenous (adj.)
"having the same or similar origin," 1856; see iso- "the same, equal" + -genous.
isogloss (n.)
1925, from German Isogloss (1892); see iso- + gloss (n.2).