Gallium n. : A rare metallic element, found in certain zinc ores. It is white, hard, and malleable, resembling aluminium, and remarcable for its low melting point (86/ F., 30/C). Symbol Ga. Atomic weight 69.9.

Example:
What are the advantages of using Gallium arsenide in solar cells or solar power panels?

Taxonomy
gallium, metal, gallium arsenide, alloys, liquid, germanium, compounds, element, melting point, semiconductor, salts, 11-20, aluminium, gallium nitrate, iron, generators, room temperature, gallium oxide.

Defination from the web:
... Gallium also attacks most other metals by diffusing into their metal lattice. ... Also, gallium metal easily alloys with many metals, and was used in small quantities in the core of the first ...