Boulder 
To see a boulder in your dream indicates that you are facing a difficult hurdle that you must overcome. This could very well be one of the most frustrating hardships that you will ever encounter.
Canteen
To dream of a canteen implies that you prefer to select simple methods of mental satisfaction rather than expending too much energy.
Centaur
To dream of a centaur represents the two sides of the personality. You are attempting to find harmony between your emotional and physical attributes. The centaur also symbolizes intelligence, empathy, and civility.
Cheetah
To dream of a cheetah indicates that you need to motivate yourself and find the energy to chase your dreams. You have been letting opportunities pass you by. If you don't reach for them now, you may never have the chance again.
Glacier
To dream about a glacier indicates your unemotional feelings. You are closing down your emotions.
Grammar
To dream that you are studying grammar indicates that you are having trouble expressing your point of view or thoughts.
Griffon
To dream about a griffon represents the benefits of transformation. You are endowed with the strength and assurance of a lion, and the sight, spirit, and attentiveness of an eagle. This dream can also indicate wisdom, power, and the sun.
Gymnast
To dream of a gymnast represents intensity, poise, and flexibility. You are working towards your goals.