malady illness, an unwholesome condition
malevolent evil intent
mallet a hammer with a wooden head on it
mania excitement manifested by mental and physical hyperactivity
manifesto a public declaration of intentions, motives or views
marionettes puppets
marmalade a jellied type of jam that contains fruit
marooned stranded
mayhem wilful and permanent crippling
meddle interfere
mediwizard wizarding equivalent to a medic
memos a written reminder
mime to play a part with actions and gestures but without words
mock an act of ridicule or derision
mollycoddling to treat someone with an overabundance of indulgence
monocle an eyeglass for one eye
pocket money a stipend sufficient for modest everyday purchases
monotony one tone, very boring
moor open, rolling, infertile land
mournful sad
Mudblood derogatory term for a Muggle-born wizard