(Greek: many, much; excessive; abnormal amount, profuse, ample, large quantity; multiple, abundant, numerous)

Don’t confuse this poly- with another -poly which means “to sell”.

In botany, having stamens joined by their filaments into a number of clusters.
Inflammation (adenitis) of several or many glands; especially with reference to the cervical group.
polyadenopathy, polyadenosis
Adenopathy affecting many lymph nodes.
Pertaining to or involving many glands.
polyaestheic, polyesthetic (adjective); more polyaestheic, polyesthetic; most polyaestheic, polyesthetic
Pertaining to, or affecting, several senses or sensations: Standing outside in a rain storm with thunder and lightning is one example of a polyaestheic experience.
polyaesthesia, polyesthesia (s) (noun); polyaesthesias, polyesthesias (pl)
A condition in which the touch of a single object seems to be felt in several different places: When Dr. Jones placed his hand on the upper part of Jasmin's back, the effect of polyaesthesia suddenly occurred because she thought she could feel his touch on the lower parts of her body as well.
polyalcohol (s) (noun), polyalcohols (pl)
An alcohol, such as glycerol, that contains more than two hydroxy groups (consisting of one atom of hydrogen and one of oxygen).
Intoxication or poisoning by a mixture of different alcohols.
polyalgesia, polyalgesic
A disorder in which a single painful stimulus produces the sensation of multiple painful stimuli.
polyamorist (s) (noun), polyamorists (pl)
Someone who has more than one open romance going on at the same time.

It should be noted that poly means "many", not "more than one".

—From new words and senses from the new 2006 update of
Merriam-Webster's Collegiate® Dictionary, Eleventh Edition.
Pertaining to, or characterized by, polyandry; mating with several males: "Recently I saw a TV documentary about polyandric societies."
A mass grave, or a grave containing many human corpses; either as the result of a natural disaster or a war.
1. The marriage of a woman to several (more than two) men at the same time.
2. A woman who practices, or favors, polyandry.
Originally, a cemetery for the many victims of great battles
1. A reference to a female who mates with several males; having more than one husband or having several husbands.
2. Literally having many male sexual partners.
3. In botany, having numerous stamens.

Related topics utilizing this poly- prefix: Polysemy and Polysemous and Polygamy Sections.

Inter-related cross references, directly or indirectly, involving word units meaning "more, plentiful, fullness, excessive, over flowing": copi-; exuber-; hyper-; multi-; opulen-; ple-; pleio-; plethor-; super-; total-; ultra-; undu-.