Anatomy A threadlike fiber or filament, such as a myofibril or neurofibril, that is a constituent of a cell or larger structure. 3. A long strand of proteins that are aggregated together in a beta-sheet structure; an amyloid fibril. fiâ²brilÂ·lar (-lÉr), fiâ²brilÂ·larâ²y (-lÄrâ²Ä) adj. fiâ²brilÂ·loseâ² (-lÅsâ²) adj.
The purpose of sustainable engineering is to design infrastructure that equitable serves a population and efficiently uses resources. Sustainable engineering is not necessarily concerned with environmental issues, but can be concerned with issues like transportation and energy.
Computer engineering is engineering of software and hardware at the level of computer (computation). that's how I look at computer science. By the way, you can be a pure computer scientist, and just do research, and decide to isolate yourself from the engineers.