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1772, "natural infantile sound of gratitude" [Weekley].
The symbol for the element tantalum.
The symbol for tantalum.
A hard, heavy, gray metallic element that is highly resistant to corrosion at low temperatures. It is used to make light-bulb filaments, surgical instruments, and glass for camera lenses. 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 Periodic Table.
The computer operator who manages a computer bulletin board, a computer display where those with access may get or convey information: People look up to the sysop
[1980s+ Computer; fr system operator]