Covered with or composed of fibrils; having a fibrillar structure or texture.
From Latin 'fibrilla' (small fiber) with the suffix '-ose' (meaning full of or characterized by). The '-ose' suffix typically appears in adjectives describing abundance of something.
Lichenologists use 'fibrillose' to describe certain lichen surfaces that feel rough and thread-like, and these characteristics actually help scientists identify species in the field without a microscope.
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