IPA: /ˈdɛdər/
KK: /ˈdɛdər/
More dead than something else; used to describe a state of being lifeless or without life in a comparative sense.
The plant looked deader than the one next to it after a week without water.
Comparative: deader
Superlative: deadest
A person who has died or is about to die.
The deader was mourned by family and friends at the funeral.
The word 'deader' is formed from 'dead' (from Old English 'dead', meaning without life) and the suffix '-er' (meaning one who). Thus, 'deader' refers to one who is more dead or lacking life compared to another.
Think of 'dead' meaning without life, and the '-er' indicating a comparison — so 'deader' means more without life than something else.