this·tle·down 
(thĭsəl-doun′)
(thĭsəl-doun′)n.
The silky down attached to the seedlike fruit of a thistle.
- straightedge
- straightedged
- straighten
- straightener
- straighten out
- straight face
- straight-faced
- circumscriptive
- circumsolar
- circumspect
- circumspection
- circumspectly
- circumstance
- circumstantial
- circumstantial evidence
- circumstantiality
- circumstantially
- circumstantiate
- circumstantiation
- circumstellar
- circumterrestrial
- circumvallate
- circumvallation
- circumvent
- circumventer