What is another name for lash hair?

Lash hair is commonly referred to as "cilia." This term specifically denotes the fine hair-like structures found around the edges of the eyelids that serve to protect the eyes from debris and particles. Cilia are designed to catch and deflect dust, insects, and other foreign substances, thereby preventing them from entering the eye.

The other options are related but refer to different types of hair or structures. "Cilias" is a misnomer in this context, as it is not commonly used in the English language to describe lash hair. "Vibrissae" pertains to the long, stiff hairs that serve a sensory function, often found on animals like cats or rodents. "Fur" generally describes the dense coat of hair found on many mammals and is not specific to the delicate lash hair structure surrounding the eyes. Therefore, "cilia" is the most accurate term for lash hair.