Etymology
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Words related to amphi-

*ambhi- 
also *mbhi-, Proto-Indo-European root meaning "around;" probably derived from *ant-bhi "from both sides," from root *ant- "front, forehead."

It forms all or part of: abaft; about; alley (n.1) "open passage between buildings;" ambagious; ambassador; ambi-; ambidexterity; ambidextrous; ambience; ambient; ambiguous; ambit; ambition; ambitious; amble; ambulance; ambulant; ambulate; ambulation; ambulatory; amphi-; amphibian; Amphictyonic; amphisbaena; Amphiscians; amphitheater; amphora; amputate; amputation; ancillary; andante; anfractuous; be-; begin; beleaguer; between; bivouac; but; by; circumambulate; embassy; ember-days; funambulist; ombudsman; perambulate; perambulation; preamble; somnambulate; somnambulism; umlaut.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit abhitah "on both sides," abhi "toward, to;" Avestan aibi; Greek amphi "round about;" Latin ambi- "around, round about;" Gaulish ambi-, Old Irish imb- "round about, about;" Old Church Slavonic oba; Lithuanian abu "both;" Old English ymbe, German um "around."
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amphibian (adj.)

1630s, "having two modes of existence; of doubtful nature," from Greek amphibia, neuter plural of amphibios "living a double life," from amphi "of both kinds" (see amphi-) + bios "life," from PIE root *gwei- "to live."

Formerly used by zoologists to describe any sort of animal at home on land and in the water, including crocodiles, walruses, beavers, seals, hippopotami; the restriction to the class of animals between fishes and reptiles with life cycles that begin in water and mature on land is from 1835; Amphibia has been used a zoological classification in this sense since 1788.

amphibrach (n.)
1580s, from Latin amphibrachus, from Greek amphibrakhys, name for a foot consisting of a long syllable between two short, literally "short at both ends," from amphi "on both sides" (see amphi-) + brakhys "short" (from PIE root *mregh-u- "short"). Related: Amphibrachic.
amphigory (n.)
"burlesque nonsense writing or verse," 1809, from French amphigouri (18c.), which is of unknown origin, perhaps itself a nonsense word, though the first element seems to suggest Greek amphi (see amphi-). The second sometimes is said to be Greek gyros "circle," making the whole thus "circle on both sides," or it may be from Greek -agoria "speech" (as in allegory, category). Related: Amphigoric.
amphisbaena (n.)
fabled serpent of ancient times, with a head at either end, late 14c., amphibena, from Medieval Latin, from Greek amphisbaena, from amphis "both ways" (see amphi-) + stem of bainein "to go, walk, step," from PIE root *gwa- "to go, come."
Amphitrite 
Greek sea-nymph, wife of Poseidon; the first element appears to be amphi "round about, on both sides, all around" (see amphi-), the second trite, fem of tritos "third," but the sense intended by the compound is unclear.
amphora (n.)
early 14c., "two-handled vessel for holding wine, oil, etc.," from Latin amphora from Greek amphoreus "an amphora, jar, urn," contraction of amphiphoreus, literally "two-handled," from amphi "on both sides" (see amphi-) + phoreus "bearer," from pherein "to bear," from PIE root *bher- (1) "to carry."

Decorative amphorae were used as ornaments and given as prizes at some public games. Also a liquid measure in the ancient world, in Greece equal to 9 gallons, in Rome to 6 gallons, 7 pints. Related: Amphoral; amphoric.
amphoteric (adj.)

of a chemical compound, "capable of reacting either as an acid or as a base," 1832, from Greek amphoteros "each or both of two," a variant of ampho "both" that replaced the earlier word. It is identical with Latin ambo and ultimately from the source of amphi- (q.v.). Other languages have the word without the nasal (Old Church Slavonic oba, Lithuanian abu) and Germanic has it without the initial vowel (Gothic bai). De Vaan writes, "There is no overall explanation for the forms, but connection with [amphi] seems clear."