Definition of para- in English:

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para-

Pronunciation: /ˈparə/
(also par-)

prefix

2 Chemistry Denoting substitution at diametrically opposite carbon atoms in a benzene ring, e.g. in 1,4 positions: paradichlorobenzene Compare with meta- and ortho-.

Origin

From Greek para 'beside'; in combinations often meaning 'amiss, irregular' and denoting alteration or modification.

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