ballast

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ballast

(bal'ăst),
1. Material of doubtful value itself used to stabilize something (for example, maritime practice). 2. Something largely without intrinsic value.

ballast 

Additional weight of material incorporated in a part of a contact lens to maintain it in a given orientation (Fig. B1). This is often provided by giving prismatic power to the lens (prism ballast lens).
Fig. B1 Truncated and prism-ballasted toric contact lensenlarge picture
Fig. B1 Truncated and prism-ballasted toric contact lens
References in periodicals archive ?
International Rectifier, IR([R]) (NYSE:IRF), a world leader in power management technology, today introduced the IRS2168D fully-integrated and protected high-voltage integrated circuit (HVIC) for advanced electronic linear fluorescent lamp ballasts which incorporate active power factor correction (PFC).
International Rectifier, IR[R] (NYSE:IRF), a world leader in power management technology, today introduced a 600V fully-integrated and protected ballast control IC for advanced linear fluorescent lamp ballasts which incorporate active power factor correction (PFC).
Other common compact fluorescent lamp ballasts that use the self-oscillating bipolar transistor solution are very simple, but are not self-starting, and require additional components such as DIACs and free-wheeling diodes.
Other compact fluorescent lamp ballasts use a self-oscillating bipolar transistor solution that requires more components and circuitry," said David Tam, International Rectifier Vice President, Consumer and Industrial Sector Business.
The IR2520D is a control IC integrating all the necessary features for fluorescent lamp ballasts.
a leading ballast manufacturer based in Rosemont, Illinois, manufactures a full line of magnetic fluorescent, HID, electronic fluorescent, and electronic HID lamp ballasts, as well as a broad family of drivers for LED light sources.