au   (TTS Sound)

The au has 2 Senses.

• atomic number 79, gold, au
• Au, 金, Ａｕ, AU
• a soft yellow malleable ductile (trivalent and univalent) metallic element; occurs mainly as nuggets in rocks and alluvial deposits; does not react with most chemicals but is attacked by chlorine and aqua regia
• 軟質の黄色い可鍛性の延性がある（三価染色体と一価染色体）金属元素

• astronomical unit, au
• 天文単位
• a unit of length used for distances within the solar system; equal to the mean distance between the Earth and the Sun (approximately 93 million miles or 150 million kilometers)
• 太陽系内の距離のために使われる長さの単位