English
addable
From add + -able.
A compound of add + -able
Proto-Indo-European *deh₃- ‘to give’
Latin addō ‘add’
Middle English adden ‘to join or unite’
English add
Today it means
adj Something that can be added to a basic model or formulation; an add-on or enhancement.
Language periods are conventional ranges, not dates for this word.
Etymograph / addable