ECCM
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～ electronic warfare undertaken to insure effective friendly use of the electromagnetic spectrum in spite of the enemy's use of electronic warfare
eccyesis
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～ pregnancy resulting from gestation elsewhere than in the uterus
ecdysiast
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～ a performer who provides erotic entertainment by undressing to music
ecdysis
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～ periodic shedding of the cuticle in arthropods or the outer skin in reptiles
ecesis
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～ (ecology) the process by which a plant or animal becomes established in a new habitat
ECF
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～ liquid containing proteins and electrolytes including the liquid in blood plasma and interstitial fluid; "the body normally has about 15 quarts of extracellular fluid"
ecg
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～ a graphical recording of the cardiac cycle produced by an electrocardiograph
echelon
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～ a body of troops arranged in a line
echelon
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～ status in a society or organization; "the upper echelon"
echelon
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～ a diffraction grating consisting of a pile of plates of equal thickness arranged stepwise with a constant offset
Echeneididae
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～ fishes having a sucking disk on the head for clinging to other fishes and to ships
Echeneis
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～ type genus of the Echeneididae: typical remoras
echidna
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～ a burrowing monotreme mammal covered with spines and having a long snout and claws for hunting ants and termites; native to Australia
echidna
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～ a burrowing monotreme mammal covered with spines and having a long snout and claws for hunting ants and termites; native to New Guinea
Echidnophaga
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～ a genus of Siphonaptera
echinacea
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～ small genus of North American coarse perennial herbs
echinocactus
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～ any cactus of the genus Echinocactus; strongly ribbed and very spiny; southwestern United States to Brazil
Echinocereus
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～ large genus of low-growing shrubby ribbed cacti of Mexico and southwestern United States
Echinochloa
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～ annual or perennial succulent grasses of warm regions
Echinochloa crusgalli
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～ a coarse annual panic grass; a cosmopolitan weed; occasionally used for hay or grazing