What term refers to a colored line of fur outlining the sides and tips of the ears?

The term that refers to a colored line of fur outlining the sides and tips of the ears is known as ear lacing. This characteristic is often observed in certain breeds of rabbits, where the edges of the ears display a distinct coloration that contrasts with the rest of the fur. Ear lacing is typically appreciated for its aesthetic appeal in show rabbits and can serve as an important feature in breed standards.

Other terms listed do not pertain to the specific coloration of ear edges. An eye circle refers to color patterns around the eyes, while embryo pertains to the developmental stage of the rabbit before it is born, and entry concerns the process of registering or participating in a competition. Understanding the terminology specific to rabbit anatomy and coloration helps in better identifying and appreciating the traits of different breeds, as well as understanding the standards used in competitions and breeding.