"Periostracum" is a word in ENGLISH

A white amorphous horny substance forming the harder part of the outer integument of insects, crustacea, and various other invertebrates; …

The process of becoming chitinous.

Having the nature of chitin; consisting of, or containing, chitin.

See Chitin.

A chitinous structure above the nervous cord in the thorax of certain Crustacea.

See Chitin.

A stomach armed with chitinous or shelly plates or teeth, as in certain insects and mollusks.

A slender outgrowth from the chitinous cuticle of insects, spiders, crustaceans, and other invertebrates. Such hairs are totally unlike those …

Any species or marine hydroids, of the genus Hydractinia and allied genera. These hydroids form, by their rootstalks, a firm, …

An inner cellular layer which lies beneath the chitinous cuticle of arthropods, annelids, and some other invertebrates.

One of the chitinous supports, or veins, in the wings of incests.

Covered with a hard chitinous case, as the pupa of certain files.

One of the cells which secrete the chitinous teeth of Mollusca.

A special structure found in the mouth of most mollusks, except bivalves. It consists of several muscles and a cartilage …

A chitinous piece between the metasternum and the pleuron of certain insects.

A chitinous structure which supports the gill in some invertebrates.

An internal dorsal chitinous process between the first two divisions of the thorax of insects.

The chitinous ribbon bearing the teeth of mollusks; -- called also lingual ribbon, and tongue. See Odontophore.

A hard chitinous or calcareous process or corpuscle, especially a spicule of the Alcyonaria.

A chitin.