Word: demagnify
Part of speech: Verb
Syllables: de
mag
ni
fy
Definition: To reduce the size of an image etc
Morphemes:
Affix: de-
Language: en
PoS: Prefix
Meaning: Intensifying; make more intense, stronger, or more marked; 
Etymology Compounds: Affix: dē-
Language: la
Decoded: de-
PoS: Prefix
Meaning: de-
Affix: magnify
Language: en
PoS: Verb
Meaning: To make (something) appear larger by means of a lens, magnifying glass, telescope etc.
Etymology Compounds: Affix: magnificāre
Language: la
Decoded: magnificare
PoS: Verb
Meaning: I prize, esteem highly.