silk gland

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of the various glands in silk-spinning insects and spiders that secrete a fluid that hardens into silk on exposure to air.

from The Century Dictionary.

• noun Any gland which secretes the substance of silk, as in the silkworm or silk-spider; a sericterium.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun silk-producing gland of insects (especially of a silkworm) or spiders