1. The bottom part of a lamp that fits into the
socket and conducts electricity to the
filament. Common
stage types include E-26/27 (medium
screwbase), G9.5 (TP-22/220, GLA family), and P28s (medium
prefocus). A socket is often incorrectly called a base.
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2. The lower, supporting portion of anything.
3. Opposite of acidic, or alkali.