Combining form for shape
maxim/o
The combining form meaning "triangle" is "trigon-" as in trigonometry.
-oid is the medical terminology combining form meaning resembling. For example, dermoid means resembling skin, and deltoid means resembling a triangle.
The combining form hist/o means
The combining form that means strange or other is "xeno-".
Combining form derm/o means: skin
A longer rhombus
The combining form that means "nail" is onych/o.
A hump is not a medical term, so I can't give you the correct combining form.
The combining form that means hidden is "crypt-" as in "cryptic" or "cryptology."
The Greek combining form hepta- means "seven."
The medical terminology combining form for "rapid" is "tachy-." For instance, tachycardia is abnormally rapid heartrate.
The combining word is sphygum