1 Fine cord of a fibrous material, such as cotton or flax, made of two or more filaments twisted together and used in needlework and the weaving of cloth.
2 A piece of such cord.
3 A thin strand, cord, or filament of natural or manufactured material.
4 Something that suggests the fineness or thinness of such a strand, cord, or filament: a thread of smoke.
5 Something that suggests the continuousness of such a strand, cord, or filament: lost the thread of his argument.
6 A helical or spiral ridge on a screw, nut, or bolt.
8 A portion of a program that can run independently of and concurrently with other portions of the program.
9 A set of posts on a newsgroup, composed of an initial post about a topic and all responses to it.
threads Slang. Clothes.