Base

[1] The lowest supporting part of an upright member.
[2] The bottom layer or coating in a series of paint coats.
[3] The major ingredient, other than pigments and filler, that make up the non-volatile portion of an adhesive, coating, or sealing compound.
[4] The region between the emitter and collector of a transistor, into which minority carriers are injected. It is essentially the control electrode of the transistor.
[5] The part of an electron tube which has pins, leads, or terminals through which connections are made to the internal electrodes.
[6] The thin flexible support on which a photographic emulsion or magnetic coating is carried.
See also bead base, edison base, flat base rim taper, flat base rim, lithium base grease, load base, negative load base, rim well base