a. 1. Consisting of two threads twisted together; using two threads. [ 1913 Webster ]

2. (Mech.) Having two screw threads instead of one; -- said of a screw in which the pitch is equal to twice the distance between the centers of adjacent threads. [ 1913 Webster ]

{ . } See under 2d Pack. [ 1913 Webster ]

n. A strong three-ply thread or small twine used to sew or tie packs or packages. [ WordNet 1.5 ]

n. [ OE. threed, þred, AS. þr&aemacr_;d; akin to D. draad, G. draht wire, thread, OHG. drāt, Icel. þrāðr a thread, Sw. tråd, Dan. traad, and AS. þrāwan to twist. See Throw, and cf. Third. ] 1. A very small twist of flax, wool, cotton, silk, or other fibrous substance, drawn out to considerable length; a compound cord consisting of two or more single yarns doubled, or joined together, and twisted; also, one fiber of a cord composed of multiple fibers. [ 1913 Webster ]

2. A filament of any substance, as of glass, gold or silver; a filamentous part of an object, such as a flower; a component fiber of any or of any fibrous substance, as of bark. [ 1913 Webster ]

3. The prominent part of the spiral of a screw or nut; the rib. See Screw, n., 1. [ 1913 Webster ]

4. (Fig.) Something continued in a long course or tenor; a recurrent theme or related sequence of events in a larger story; as the thread of a story, or of life, or of a discourse. Bp. Burnet. [ 1913 Webster ]

5. Fig.: Composition; quality; fineness. [ Obs. ] [ 1913 Webster ]

A neat courtier,
Of a most elegant thread. B. Jonson. [ 1913 Webster ]

6. (Computers) A related sequence of instructions or actions within a program that runs at least in part independent of other actions within the program; -- such threads are capable of being executed only in oprating systems permittnig multitasking. [ PJC ]

7. (Computers) A sequence of messages posted to an on-line newsgroup or discussion group, dealing with the same topic; -- messages in such a thread typically refer to a previous posting, thus allowing their identification as part of the thread. Some news-reading programs allow a user to follow a single such thread independent of the other postings to that newsgroup. [ PJC ]

Air thread, the fine white filaments which are seen floating in the air in summer, the production of spiders; gossamer. --
Thread and thrum, the good and bad together. [ Obs. ] Shak. --
Thread cell (Zool.), a lasso cell. See under Lasso. --
Thread herring (Zool.), the gizzard shad. See under Gizzard. --
Thread lace, lace made of linen thread. --
Thread needle, a game in which children stand in a row, joining hands, and in which the outer one, still holding his neighbor, runs between the others; -- called also thread the needle. [ 1913 Webster ]

v. t. [ imp. & p. p. Threaded; p. pr. & vb. n. Threading. ] 1. To pass a thread through the eye of; as, to thread a needle. [ 1913 Webster ]

2. To pass or pierce through as a narrow way; also, to effect or make, as one's way, through or between obstacles; to thrid. [ 1913 Webster ]

Heavy trading ships . . . threading the Bosphorus. Mitford. [ 1913 Webster ]

They would not thread the gates. Shak. [ 1913 Webster ]

3. To form a thread, or spiral rib, on or in; as, to thread a screw or nut. [ 1913 Webster ]

a. 1. Worn to the naked thread; having the nap worn off; threadbare clothes. “A threadbare cope.” Chaucer. [ 1913 Webster ]

2. Fig.: Worn out; as, a threadbare subject; stale topics and threadbare quotations. Swift. [ 1913 Webster ]

n. The state of being threadbare. [ 1913 Webster ]

a. Made of thread; as, threaden sails; a threaden fillet. [ Obs. ] Shak. [ 1913 Webster ]

n. 1. A device for assisting in threading a needle. [ 1913 Webster ]

2. A tool or machine for forming a thread on a screw or in a nut. [ 1913 Webster ]

n. (Zool.) Any one of several species of fishes belonging to Polynemus and allied genera. They have numerous long pectoral filaments. [ 1913 Webster ]

n. (Zool.) (a) The cutlass fish. (b) A carangoid fish (Caranx gallus, or Caranx crinitus) having the anterior rays of the soft dorsal and anal fins prolonged in the form of long threads. [ 1913 Webster ]

n. Quality of being thready. [ 1913 Webster ]

n. pl. Clothes; clothing; as, he was wearing his new threads at the party. [ Slang ] [ PJC ]

a. Having the form of a thread; filiform. [ 1913 Webster ]

n. (Zool.) Any long, slender nematode worm, especially the pinworm and filaria. [ 1913 Webster ]

a. 1. Like thread or filaments; slender; as, the thready roots of a shrub. [ 1913 Webster ]

2. Containing, or consisting of, thread. [ 1913 Webster ]

v. t. [ 1st pref. un- + thread. ] [ 1913 Webster ]

1. To draw or take out a thread from; as, to unthread a needle. [ 1913 Webster ]

2. To deprive of ligaments; to loose the ligaments of. [ 1913 Webster ]

He with his bare wand can unthread thy joints. Milton. [ 1913 Webster ]

3. To make one's way through; to traverse; as, to unthread a devious path. De Quincey. [ 1913 Webster ]