1) Burl 2) Deliberate lump in fabric 3) Fuzzy fabric lump 4) Knot 5) Nubbly yarn 6) Roughness 7) Soft lump in yarn 8) Textured sort of knit 9) Yarn irregularity 10) Yarn knot 11) Yarn lump 12) Yarn with nubbly fibers 13) Yarn with untwisted fibers 
[software] SLUB (`the unqueued slab allocator`) is a memory management mechanism intended for the efficient memory allocation of kernel objects which displays the desirable property of eliminating fragmentation caused by allocations and deallocations. The technique is used to retain allocated memory that contains a data object of a certain ...[knitting] ==13-20 May== ==21-28 May== ==29 May - 3 June== ==4-10 June== ==11-17 June== ==18 June - 1 July== ==2-15 July== ==16-22 July== ==22-29 July== ==30 July - 31 August== ==1 September - 30 October== ...
• (v. t.) To draw out and twist slightly; -- said of slivers of wool. • (n.) A roll of wool slightly twisted; a rove; -- called also slubbing.
An irregular thickened spot in a yarn. 
an uneven section in a yarn which gives fabric a rough texture
A length of one or more filaments wrapped around the yarn
A thick place in a strand of YARN caused by improper SPINNING.
Slub noun [ Etymol. uncertain.] A roll of wool slightly twisted; a rove; -- called also slubbing . Slub transitive verb [ imperfect & past participle Slubbed ; present participle & verbal noun Slubbing .] To draw out and twist slightly; -- said of slivers of wool. 
[n] - soft lump or unevenness in a yarn
knot noun soft lump or unevenness in a yarn; either an imperfection or created by design