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There are 18 twelve-letter words beginning with AMPHI

AMPHIBIOUSLY	• amphibiously adv. In the manner of an amphibian. • amphibiously adv. In an amphibious manner. • AMPHIBIOUS adv. adapted for both land and water.
AMPHIBLASTIC	• amphiblastic adj. (Biology) Segmenting unequally; said of telolecithal ova with complete segmentation. • AMPHIBLASTIC adj. of animal ova, showing complete but unequal cleavage after fertilization.
AMPHIBOLITES	• amphibolites n. Plural of amphibolite. • AMPHIBOLITE n. rock composed of amphibole; hornblende.
AMPHIBRACHIC	• amphibrachic adj. Consisting of amphibrachs, metrical feet consisting of either a long syllable between two that are short… • AMPHIBRACHIC adj. of or like an amphibrach, a foot of three syllables, the middle one long, the first and last short.
AMPHICOELOUS	• amphicoelous adj. (Zoology, of vertebrae) Having both ends concave; biconcave. • AMPHICOELOUS adj. of the vertebrae of most fishes and some amphibians, concave at the anterior and posterior ends.
AMPHICTYONIC	• amphictyonic adj. (Ancient Greece) Of or relating to the amphictyons or their League or Council. • AMPHICTYONIC adj. applied to the ancient Greek council of state-deputies.
AMPHIDENTATE	• AMPHIDENTATE adj. of a ligand, able to coordinate through either of two different atoms, also AMBIDENTATE.
AMPHIDIPLOID	• amphidiploid adj. (Genetics) Having a diploid set of chromosomes from each of its parents. • amphidiploid n. (Biology) Such an organism. • AMPHIDIPLOID n. a hybrid having a complete diploid chromosome set from each parent.
AMPHIGASTRIA	• AMPHIGASTRIUM n. a scalelike leaf on the ventral side of some liverworts.
AMPHISBAENAE	• amphisbænæ n. Plural of amphisbæna. • AMPHISBAENA n. a worm-lizard; also, a mythical two-headed serpent or lizard.
AMPHISBAENAS	• amphisbaenas n. Plural of amphisbaena. • amphisbænas n. Plural of amphisbæna. • AMPHISBAENA n. a worm-lizard; also, a mythical two-headed serpent or lizard.
AMPHISBAENIC	• amphisbaenic adj. (Mythology) Relating to an amphisbaena. • AMPHISBAENIC adj. of or like an amphisbaena.
AMPHISTOMOUS	• amphistomous adj. (Zoology) Having a sucker at each extremity. • AMPHISTOMOUS adj. having a sucker at either end, as some worms.
AMPHISTYLARS	• AMPHISTYLAR n. a temple having a set of columns at both ends or at both sides.
AMPHITHEATER	• amphitheater n. American spelling form of amphitheatre. • AMPHITHEATER n. an oval or circular building with rising tiers of seats ranged about an open space.
AMPHITHEATRE	• amphitheatre n. An open, outdoor theatre (which may be a theatre in the round, or have a stage with seating on only… • amphitheatre n. (Geology) A natural formation of a similar shape, where a steep mountain or slope a particular rock… • AMPHITHEATRE n. an oval or circular building with rising tiers of seats ranged about an open space.
AMPHITHECIUM	• AMPHITHECIUM n. the outer layer of cells of the embryo of mosses and liverworts that develops into the outer parts of the spore-bearing capsule.
AMPHITROPOUS	• amphitropous adj. (Botany) Having the ovule bent so that the ends are near each other. • AMPHITROPOUS adj. of an ovule, with its point of attachment in the middle.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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English Wiktionary: 61 words
Scrabble in French: 7 words
Scrabble in Spanish: no word
Scrabble in Italian: no word
Scrabble in German: no word
Scrabble in Romanian: no word

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