spa is it abbreviation or its just a word?

Me and my friend had this argument today, she says that spa is abbreviation, but I have doubts.
Spa salon/beauty etc….

I am pretty sure that “spa” is just a word…

Portable Massage Table Tattoo Spa Beauty Facial Bed U1M Salon Chiro Exam $98.00

Portable Massage Chair Tattoo Spa Beauty Salon Therapy Black PU Leather 3″ Foam $56.95

Portable Massage Chair Tattoo Spa Beauty Salon Therapy Black PU Leather 3″ Foam $56.95

Portable Massage Chair Tattoo Spa Beauty Salon Therapy Black PU Leather 3″ Foam $56.95

Portable Massage Chair Tattoo Spa Beauty Salon Therapy Black PU Leather 3″ Foam $56.95

Portable Massage Chair Tattoo Spa Beauty Salon Therapy Black PU Leather 3″ Foam $56.95

WHITE HYDRAULIC MASSAGE FACIAL TABLE BED CHAIR STOOL SPA BEAUTY SALON EQUIPMENT $339.88

WHITE HYDRAULIC MASSAGE FACIAL TABLE BED TRAY STOOL SPA BEAUTY SALON EQUIPMENT $389.88

Portable Massage Chair Tattoo Spa Beauty Salon Therapy Black PU Leather 3″ Foam $56.95

Portable Massage Table Tattoo Spa Beauty Facial Bed U1M Salon Chiro Exam $98.00

The Salon – Spa Cash (DVD) $27.47 At the epicenter of the neighborhood is Jenny`s beauty salon, where women flock to get made over and to feel at home. For owner Jenny (Vivica A. Fox) and her loyal patrons, it`s more than just a business; it`s a community fixture. But all this quickly comes under threat when a good-looking businessman arrives at the salon to warn Jenny of corporate sharks driving out local shops. While deeply protective of her salon, Jenny faces a predicament when she finds herself attracted to the man relaying the message.

Pretend Beauty Salon $14.99 Pretend Beauty Salon – Premium Poster