The gluteal cleft, natal cleft or anal cleft
That would be a "cleft". The terms cleft chin, butt chin, chin cleft,, superhero chin, dimple chin, or a chin dimple refer to a dimple on the chin
Congenital fissure of the palate is known as cleft palate. This is a condition with different levels of severity.
Palate
It is called a true cleft pallate.
Gluteal cleft, natal cleft or anal cleft.
An anal cleft is the groove between a person's buttocks, also known as the gluteal cleft.
Other terms for "buttcrack" are: the intergluteal cleft, the natal cleft, vertical gluteal crease, the gluteal cleft. It is the groove between the buttocks that runs from the sacrum to the perineum.
The gluteal cleft, natal cleft or anal cleft
The medical terms:ButtocksMaximus Gluteus (large muscles of buttocks)Gluteus Medius (smaller muscles of buttocks)Anus (opening)Rectum (lowest part of intestine leading to anus)Gluteal cleft, natal cleft, vertical gluteal crease (for the "crack" between the buttocks)
Keep the area clean and dry, using an ointment like for diaper rash, then an absorbent powder, if necessary. The shape of the back muscles sends perspiration down down the gluteal cleft, especially if your rear end is large. Check the ointment to ensure that it contains zinc oxide.
Synonyms for butt (meaning the body part)The medical terms:ButtocksMaximus Gluteus (large muscles of buttocks)Gluteus Medius (smaller muscles of buttocks)Anus (opening)Rectum (lowest part of intestine leading to anus)Gluteal cleft, natal cleft, vertical gluteal crease (for the "crack" between the buttocks)Lay terms:BootyRear endPosteriorFannyHeinyBottomRearBacksideRumpKeisterTooshieTushSeatArseA$$DerriereHind endBunsTail endTailCheeksBum
gluteal fold
A cleft lip
Synaptic Cleft.
A harelip
Synaptic cleft .