1. A jacket or outer covering of wood, etc., to prevent radiation of heat, as from the boiler, cylinder. etc., of a steam engine.
2. The planking or boarding of a shaft, cofferdam, etc.
CLEAN Clean, a. [Compar. Cleaner (; superl. Cleanest.] Etym: [OE. clene, AS. cl; akin to OHG. chleini pure, neat, graceful, small, G. klein small, and perh. to W. glan clean, pure, bright; all perh. from a primitive, meaning bright, shining. Cf. Glair.]
1. Free from dirt or filth; as, clean clothes.
2. Free from that which is useless or injurious; without defects; as, clean land; clean timber.
3. Free from awkwardness; not bungling; adroit; dexterous; as, aclean trick; a clean leap over a fence.
4. Free from errors and vulgarisms; as, a clean style.
5. Free from restraint or neglect; complete; entire. When ye reap the harvest of your land, thou shalt not make clean riddance of corners of thy field. Le
6. Free from moral defilement; sinless; pure. Create in me a clean heart, O God. Ps. li. 10 That I am whole, and clean, and meet for Heaven Tennyson.
7. (Script.)