Portuguese term (edited): bocal de l�mpada

Lamp = luminária, abajur
Bulb (ou light bulb) = lâmpada

O bocal é a parte fêmea, onde se encaixa a lâmpada na luminária, seja rosqueada ou do tipo baioneta.

Veja estes exemplos:

Bulb Socket Screw Terminals by Bakers Pride - 253-1248 - 253-1248 ...
Bulb Socket Screw Terminals Porcelain Bulb Socket 125 volt, 50 watts For Bakers
Pride deck pizza ovens model series X300, X500, X700 Bakers Pride no.
www.instawares.com/ Bulb-Socket-Screw-Terminals.253-1248.0.7.htm

Light Bulb Socket
Offers Light Bulb Socket, products for deaf, deafness, hearing impaired, hard of hearing. hearing loss, tmobile sidekick, sidekick, blackberry, ...
www.harriscomm.com/catalog/ product_info.php?products_id=2306

Bad bulb holder for dash wiring
Apparently the older bulb socket has smaller thread diameter, and the older bulb has larger thread diameter. So I measured all parts with a dial caliper. ...
http://mgaguru.com/mgtech/faulty/ft019.htm

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Note added at 2 hrs 9 mins (2005-06-16 13:54:30 GMT)
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Os links corretos para os dois primeiros exemplos são:
www.instawares.com/Bulb-Socket-Screw-Terminals.253-1248.0.7...
www.harriscomm.com/catalog/product_info.php?products_id=230...

Esta frase vem do segundo exemplo. Veja a diferença entre \"lamp\" e \"bulb\":

For those who don\'t need or want a lamp, just plug a light bulb into the light bulb socket and use it instead of a lamp. Ivory color.