Word List: retro-, an-, anti backward, back, against, opposite
antacid a substance that works against stomach acid
antibacterial designed to fight against or kill bacteria
antidote a remedy or cure; something works against a poison
antihistamine a medicine that works against colds and allergies
antonym a word that means the opposite of another word
retroactive goes back to a prior time
retrofit to go back and install something that was not available at the time of original manufacturing
retrospective characterized by looking back at the pat and reflecting related to the past http://cnet1.cbsistatic.com/hub/i/2015/07/19/ecef5b9d-605e-4082-9f97-eeb2e12b34f0/952607e46553ef4da993cb2a2a5ab2cb/millenniumfalcon.gif