What does armature mean?
The definition of armature
Ar”ma*ture, n.
Etym: [L. armatura, fr. armare to arm: cf. F. armature. See Arm, v. t., Armor.]

1 Armor; whatever is worn or used for the protection and defense of the body, esp. the protective outfit of some animals and plants.
2 (Magnetism)
A piece of soft iron used to connect the two poles of a magnet, or electro-magnet, in order to complete the circuit, or to receive and apply the magnetic force. In the ordinary horseshoe magnet, it serves to prevent the dissipation of the magnetic force.
3 (Arch.)
Iron bars or framing employed for the consolidation of a building, as in sustaining slender columns, holding up canopies, etc. Oxf. Gloss.