Testaceous animals(Zoöl.), animals having a firm, calcareous shell, as oysters and clams, thus distinguished from crustaceous animals, whose shells are more thin and soft, and consist of several joints, or articulations, as lobsters and crabs.

(Tes"ta*cy) n. [See Testate.] (Law) The state or circumstance of being testate, or of leaving a valid will, or testament, at death.

(Test), v. t. [imp. & p. p. Tested; p. pr. & vb. n. Testing.]

1. (Metal.) To refine, as gold or silver, in a test, or cupel; to subject to cupellation.

2. To put to the proof; to prove the truth, genuineness, or quality of by experiment, or by some principle or standard; to try; as, to test the soundness of a principle; to test the validity of an argument.

Experience is the surest standard by which to test the real tendency of the existing constitution.

3. (Chem.) To examine or try, as by the use of some reagent; as, to test a solution by litmus paper.

(Test) n. [L. testis. Cf. Testament, Testify.] A witness. [Obs.]

Prelates and great lords of England, who were for the more surety tests of that deed.
Ld. Berners.

(Test), v. i. [L. testari. See Testament.] To make a testament, or will. [Obs.]

(Test ||Tes"ta) n.; pl. E. Tests L. Testæ [L. testa a piece of burned clay, a broken piece of earthenware, a shell. See Test a cupel.]

1. (Zoöl.) The external hard or firm covering of many invertebrate animals.

The test of crustaceans and insects is composed largely of chitin; in mollusks it is composed chiefly of calcium carbonate, and is called the shell.

2. (Bot.) The outer integument of a seed; the episperm, or spermoderm.

(Test"a*ble) a. [See Testament.]

1. Capable of being tested or proved.

2. Capable of being devised, or given by will.

(||Tes*ta"ce*a) n. pl. [NL., fr. L. testaceum a shelled anumal. See Testaceous.] (Zoöl.) Invertebrate animals covered with shells, especially mollusks; shellfish.

(Tes*ta"cean) n. (Zoöl.) Onr of the Testacea.

(Tes*ta`ce*og"ra*phy) n. [Testacea + -graphy: cf. F. testacéographie.] The science which treats of testaceans, or shellfish; the description of shellfish. [R.]

(Tes*ta`ce*ol"o*gy) n. [Testacea + -logy: cf. F. testacéologie.] The science of testaceous mollusks; conchology. [R.]

(Tes*ta"ceous) a. [L. testaceus, fr. testa a shell. See Testa.]

1. Of or pertaining to shells; consisted of a hard shell, or having a hard shell.

2. (Bot. & Zoöl.) Having a dull red brick color or a brownish yellow color.

  By PanEris using Melati.

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