The selected route begins with Persian līmū, passes through Arabic and Medieval Latin, then reaches English through French.
One variant is selected per stage. Arabic līmūn and Persian līmun are alternatives, not additional chronological steps; Latin limon- is a stem.
Sources
- Merriam-Webster: lemon
Noun Word History supplies all six selected stages and the alternative forms.
- Online Etymology Dictionary · lemon
Meanings of the older forms on the word path.
- Digital Dictionaries of South Asia · steingass query.py
Meanings of the older forms on the word path.
- logeion.uchicago.edu · limo
Meanings of the older forms on the word path.