Well, here it is nearly the end of summer and finally, an interesting word.
Scrim describes a type of cloth. Scrim is used for curtains, glued on the inside of fabric panels to make them resist shrinking, and also refers to a curtain used in the theater.
An excerpt from some open-source online dictionaries follows:
Scrim Scrim, n.
1. A kind of light cotton or linen fabric, often woven in
openwork patterns, -- used for curtains, etc,; -- called
also India scrim.
2. pl. Thin canvas glued on the inside of panels to prevent
shrinking, checking, etc.
-- From The Collaborative International Dictionary of English v.0.48
n : a firm open-weave fabric used for a curtain in the theater
-- From WordNet (r) 2.0
34 Moby Thesaurus words for "scrim":
act drop, asbestos, asbestos board, backdrop, batten, border,
cloth, coulisse, counterweight, curtain, curtain board, cyclorama,
decor, drop, drop curtain, fire curtain, flat, flipper, hanging,
rag, scene, scenery, screen, side scene, stage screw, tab, tableau,
teaser, tormentor, transformation, transformation scene, wing,
-- From Moby Thesaurus II by Grady Ward, 1.0