tes·ta·ceous 
(tĕ-stāshəs)
(tĕ-stāshəs)adj.
1. Biology
a. Having a hard shell or shell-like outer covering: testaceous echinoderms.
b. Composed of a shell or shell-like material: a testaceous operculum.
2. Having the reddish-brown or brownish-yellow hue of bricks.
[From Latin testāceus, from testa, shell.]
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