English
helpable
From help + -able.
Formed from help + -able
Proto-Indo-European *ḱelb- ‘to help’
…
Proto-Germanic *helpō ‘help, aid’
Proto-West Germanic *helpu
Old English help ‘help, aid, assistance’
Middle English help
English help
Today it means
adj Capable of being helped.
Language periods are conventional ranges, not dates for this word.
Etymograph / helpable