1. Pertaining to shells; consisting of a hard shell, or having a hard continuous shell.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• restaceous,
• festaceous,
• gestaceous,
• yestaceous,
• 6estaceous,
• 5estaceous,
• twstaceous,
• tsstaceous,
• tdstaceous,
• trstaceous,
• t4staceous,
• t3staceous,
• teataceous,
• testaceious,
• tesaceous,
• testacous,
• testaceus,
• testaceos,
• tastaceous,
• Tessaceous

• testicle,
• test-cross,
• testacea,
• test case,
• test copy,
• testcross,
• testacean.

The adjective form of the word "testaceous" is "testaceous".

The plural form of the word "testaceous" is "testaceous".

The singular form of the word "testaceous" is "testacean"