Feather is a term used to describe the light, fluffy structures found on birds and other animals. The prefix PTER is derived from the Greek word for wing, and is commonly used in scientific terms related to wings and flight. PTERO is a variation of the same prefix, and is also used in scientific terms related to wings and flight. PINNI is a Latin-derived prefix meaning feather or wing, and is also used in scientific terms related to feathers and wings. All three of these prefixes are commonly used in scientific terms related to feathers and wings.