1.  testudo(n = noun.artifact) - a movable protective covering that provided protection from above; used by Roman troops when approaching the walls of a besieged fortification;
is a kind of protection, protective cover, protective covering

2.  testudo(n = noun.animal) genus testudo - type genus of the Testudinidae;
is a kind of reptile genus
is a member of family testudinidae, testudinidae

1.  A genus of tortoises which formerly included a large number of diverse forms, but is now restricted to certain terrestrial species, such as the European land tortoise (Testudo Græca) and the gopher of the Southern United States. [1913 Webster]

2.  A cover or screen which a body of troops formed with their shields or targets, by holding them over their heads when standing close to each other. This cover resembled the back of a tortoise, and served to shelter the men from darts, stones, and other missiles. A similar defense was sometimes formed of boards, and moved on wheels. [1913 Webster]

3.  A kind of musical instrument. a species of lyre; -- so called in allusion to the lyre of Mercury, fabled to have been made of the shell of a tortoise. [1913 Webster]

testudo, n. (pl. -os or testudines) Rom.Hist.
1 a screen formed by a body of troops in close array with overlapping shields.
2 a movable screen to protect besieging troops.

Etymology:
L testudo -dinis, lit. 'tortoise' (as TEST(2))

genus testudo, testudo graeca