| tantalum. |
| Ta The symbol for the element tantalum. |
| TA abbr. teaching assistant |
tan·ta·lum (tān'tə-ləm) n. Symbol Ta A very hard, heavy, gray metallic element that is exceptionally resistant to chemical attack below 150°C. It is used to make light-bulb filaments, electrolytic capacitors, lightning arresters, nuclear reactor parts, and some surgical instruments. Atomic number 73; atomic weight 180.948; melting point 2,996°C; boiling point 5,425°C; specific gravity 16.6; valence 2, 3, 4, 5. See Table at element. [New Latin, from Latin Tantalus, Tantalus (from its high resistance to absorbing acids even when immersed in them); see Tantalus.] |
| teaching assistant n. Abbr. TA A graduate student in a university or college who is awarded a fellowship that provides him or her with financial aid in exchange for teaching duties. Also called teaching fellow. teaching assistantship n. |
Ta
The symbol for the element tantalum.
| ta Tamil |
| Ta tantalum |
TA
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