| infection thread | In the formation of root nodules, a cellulosic tube through which Rhizobium cells can travel to reach and infect root cells. (09 Oct 1997) |
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| terminal thread | A long, slender connective tissue (pia mater) strand extending from the extremity of the medullary cone to the internal aspect of the spinal dural sac (filum terminale internum); stout strands of connective tissue attaching the spinal dural sac to the coccyx (filum terminale externum), commonly called the coccygeal ligament. Synonym: filum terminale, nervus impar, terminal thread. (05 Mar 2000) |
| thread | 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. 2. A filament, as of a flower, or of any fibrous substance, as of bark; also, a line of gold or silver. 3. The prominent part of the spiral of a screw or nut; the rib. See Screw. 4. Something continued in a long course or tenor; a,s the thread of life, or of a discourse. 5. Composition; quality; fineness. "A neat courtier, Of a most elegant thread." (B. Jonson) 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. <zoology> Thread cell, the gizzard shad. See 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. Origin: OE. Threed, red, AS. Rd; akin to D. Draad, G. Draht wire, thread, OHG. Drat, Icel. Rar a thread, Sw. Trad, Dan. Traad, and AS. Rawan to twist. See Throw, and cf. Third. Source: Websters Dictionary (01 Mar 1998) |