Does that mean that 'ant' and 'anti' are the same thing and they can be used interchangibly?
ant-
prefix
a variant of http://www.thefreedictionary.com/anti-antacid
© HarperCollins Publishers 1991, 1994, 1998, 2000, 2003
What do you mean, "heel"? No. The dictionary is telling you that the "ant-" you see in "antacid" and "antagonize" is the same prefix as the "anti-" in "antidepressant" and "antidisestablishmentarianism", but modified in spelling for reasons of pronunciation or something else.
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soheil1'heel' means 'hello', perhaps.Hail.