scabrule

Possibly a descendant of Latin scaber + -ule (This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium. Particularly: “Preceding etymology is speculative.”)

scabrule (plural scabrules)

1. (botany) Short, stiff projections or hairs which give a stem or leaf a rough texture, at least in one direction.
   • 2004, Arthur Haines et al., “Records for Carex rostrata (Cyperaceae) in New England”, in Rhodora, volume 106, number 927, →JSTOR:

     Rare specimens will have one or more leaves covered adaxially with tiny scabrules, which provide a rough texture to the leaf.

• arbuscle, cursable