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echocardiograph
echoencephalogram
echoencephalograph
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echographia
echography
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ecology
e·col·o·gy [ i kólləjee ]


noun 
Definition:
 
1. study of organisms and the environment: the study of the relationships between living organisms and their interactions with their natural or developed environment
2. social sciences 
Same as  human ecology
[Late 19th century. < Greek oikos "house, habitation"]

ec·o·log·i·cal [ èkə lójjik'l, kə lójjik'l ] adjective
ec·o·log·i·cal·ly adverb
e·col·o·gist noun
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