Definition of prefocus in English:

prefocus

Syllabification: pre·fo·cus
Pronunciation: /ˈprēˈfōkəs
 
/

adjective

[attributive]
  • Relating to or denoting a light bulb that is designed so that its beam is focused automatically when it is fitted inside a lamp, especially a vehicle headlamp.

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Word of the day kerf
Pronunciation: kərf
noun
a slit made by cutting with a saw