No, the root word "sol" does not mean alone. It typically refers to the sun or something related to the sun.
The root word "sol" in solitaire is derived from the Latin word "solitarius," meaning alone or solitary. In the context of solitaire games, it refers to games that can be played alone.
Some words that start with 'sol' are:solacesolarsolariumsoldersoldiersolesolemnsolenoidsolicitsolidsoliloquysolitairesolitudesolosolsticesolublesolutionsolvesolvencysolvent
Solo
It doesnt have a greek root, its latin sol
Solus - an adjective meaning 'only, single, alone'
It comes from the Greek word kylindein meaining "to roll"
If by "the root sol" you mean the Latin word for "sun," then not at all. Disconsolate is ultimately from Latin solari "to soothe," from the Proto-Indo-European root *sel-. The Latin word for "sun" is from the unrelated Proto-Indo-European sawol.
The word "solar" is likely derived from the Latin word "sol," which means sun. This root "sol" is associated with the sun and sunlight, rather than meaning "only." The term "solar" is often used to describe things related to the sun, such as solar panels or solar energy.
The root "sol" meaning alone has a few words with this root that actually mean alone, these include; solo, solitude, and soloist
Sol is Latin for 'sun'. It's the Latin root word for the adjective 'solaris', which means 'of the sun, solar'. It also is the Latin root word for 'solarium', which means 'sundial, balcony or terrace exposed to the sun'. It combines with the verb 'fero ferre' ['to bear, bring, carry'], to form 'solifer', which means 'sun-bringing'. It also combines with the verb 'sisto sistere' ['to stand still'], to form 'solstitium', which means 'the solstice'.
This from Wikipedia:from Arabic طلاسم tilasm, ultimately from Greek telesma or from the Greek word "telein" which means "to initiate into the mysteries"