起伏型 is a term for words that have a pitch drop.
In Japanese accent, a distinction is made between 起伏型 and 平板型.
頭高型 is a subtype of 起伏型 where the pitch drops immediately after the first mora.
中高型 is a subtype of 起伏型 where the pitch drops somewhere in the middle of the word.
尾高型 is a subtype of 起伏型 where the pitch drops after the final mora.
Compound of 起伏 (undulation, rise and fall) and 型 (type, pattern). The term describes a pitch pattern that rises and then falls.