pyg-, pygo-, -pyga, -pygia

(Greek: rump, bottom; rear end; behind part; the posterior or back part of the body)

pygobombes
Men or women with well-rounded rumps.
pygobranchia
A group of gastropods having the gills arranged round the anus.
pygobranchiate
pygodidymus
A fetus with double hips and pelvis.
pygopagous, pygopagus
Twins united in the region of the buttocks so that the two are back to back.
pygophilia
Arousal from contact with the buttocks.
pygophilist
A person who is especially fond of buttocks.
pygophilous (adjective), more pygophilous, most pygophilous
1. A reference to fondness for sexy back sides.
2. Pertaining to men who have a special attraction for female bottoms.
pygophily
pygopod
1. Of or pertaining to the Pygopodes, an order of aquatic birds, including the auks, grebes, and loons, having the legs set very far back on their bodies.
pygopodous
Of or belonging to the genus Pygopus or family Pygopodidae of Australian lizards having rudimentary hind legs.
pygoscopia (s) (noun), pygoscopias (pl)
The observance of someone's backside: Pygoscopia may be particularly true when the observed person has what is considered enhancements that attract attention; such as, callipygian (beautifully proportioned bottom) or spheropygian (full and rounded bottom)."
Viewing a callipygian or the act of pygoscopia.
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Would you guys quit leering at my backside! Don't deny it! Why can't you just quit staring at me?

Some women apparently don't like to be the object of pygoscopia by other people

Defined as someone who is obviously looking intently at another person's posterior seat of the body, pagoscopia may be a form of flattery or a condition of embarrassment for the one who is being so obviously ogled.

The great question that has never been answered, and which I have not yet been able to answer, despite my thirty years in research into the feminine soul, is "What does a woman want?"

—Sigmund Freud (1856-1939).
pygoscopophobia (s) (noun), pygoscopophobias (pl)
An "internal writhing" or pathological hatred that someone is watching the subject's behind or one's rump: Becky had a very good figure, but, suffering from pygoscopophobia, certainly had an intense dislike of men looking at her bottom, so she tried to wear very simple and dark clothes.
quatopygia
An enticing movement of a man or woman's rear end.
spheropygian
Having rounded and full buttocks.

Word families with similar applications: "back, backside" word units: dorso- (back, on the back); lumbo- (loin, lower back); nuch- (nape of the neck).