adjective. shaped like a hair; long and slender.

adjective. long and slender with a very fine internal diameter.

adjective. Resembling hair; having the texture, consistency, or appearance of hair.

adjective. long and slender with a very small internal diameter

"Little eggs are hatched and the young are passed out by the way of the mouth, and they go swimming about as little oval bodies covered with a very curious kind of hairlike processes."

thin  

cliffy  fernlike  flexuous  glacé  graded-index  

bristlelike  capillaceous  capillary  capillary  capilliform