Combining form for shape
Delt- is the medical terminology combining form meaning triangle.
-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
A longer rhombus
Xeno- is the combining form meaning strange or other.
Combining form derm/o means: skin
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 prefix hepta- means seven.
The combining form that means hidden is "crypt-" as in "cryptic" or "cryptology."
The combining form that means triangular area is "triangul/o." It is often used in medical and scientific terminology to refer to structures or areas shaped like a triangle. For example, it can be found in terms related to anatomy or geometry involving triangular regions.
The medical terminology combining form for "rapid" is "tachy-." For instance, tachycardia is abnormally rapid heartrate.