Teat: Meaning, Animal Anatomy, Human Usage, and Sexual Slang
A teat is the milk-releasing projection of an animal’s mammary gland and may also mean a bottle nipple or a crude term for a human nipple.
Nipple: Meaning, Anatomy, Sensitivity, Lactation, and Sexuality
A nipple is the projecting structure at the center of the areola and may function in lactation, physical sensation, sexual pleasure, and body expression.