prefocusedadj.

Brit.

/priːˈfəʊkəst/, U.S.

/priˈfoʊkəst/

Forms: see pre- prefix and focused adj.

Origin: Formed within English, by derivation. Etymons: pre- prefix, focused adj.

Etymology: < pre- prefix + focused adj. Compare prefocus adj. and later prefocus v.

Focused beforehand or in advance; having a preset focus; (of a vehicle headlamp) = prefocus adj.

ΘΚΠ

the world > matter > light > artificial light > an artificial light > artificial light defined by light-source > electric light > [adjective] > of other types of electric light

bayonet-capped1904

filamentless1934

prefocused1939

short-arc1955

1939 R. F. Collins in K. Henney & B. Dudley Handbk. Photogr. xxviii. 802 Illumination is best provided by strong—50 watt or more—prefocused-type incandescent lamps.

1954 A. W. Judge Automobile Electr. Maintenance (ed. 3) viii. 209 In the case of recent American-type headlamps, ‘sealed-beam’ units are employed. These consist of a lens, bulb, and reflector unit built into one water- and dust-proof pre-focused unit.

1955 G. Oster in R. C. Mellors Analyt. Cytol. ix. 9/3 The development of their prefocused x-ray tube.

1992 Police June 23 (advt.) You need to know that every time you reach for your flashlight, it has a fresh, full charge and a blinding, prefocused halogen beam.

2002 Physics of Plasmas 9 3617 A high quality prefocused seed pulse is shown to remain well-focused through the entire process of the seed amplification.

This is a new entry (OED Third Edition, March 2007; most recently modified version published online March 2022).

单词	prefocused
释义	prefocusedadj. Brit. /priːˈfəʊkəst/, U.S. /priˈfoʊkəst/ Forms: see pre- prefix and focused adj. Origin: Formed within English, by derivation. Etymons: pre- prefix, focused adj. Etymology: < pre- prefix + focused adj. Compare prefocus adj. and later prefocus v. Focused beforehand or in advance; having a preset focus; (of a vehicle headlamp) = prefocus adj. ΘΚΠ the world > matter > light > artificial light > an artificial light > artificial light defined by light-source > electric light > [adjective] > of other types of electric light bayonet-capped1904 filamentless1934 prefocused1939 short-arc1955 1939 R. F. Collins in K. Henney & B. Dudley Handbk. Photogr. xxviii. 802 Illumination is best provided by strong—50 watt or more—prefocused-type incandescent lamps. 1954 A. W. Judge Automobile Electr. Maintenance (ed. 3) viii. 209 In the case of recent American-type headlamps, ‘sealed-beam’ units are employed. These consist of a lens, bulb, and reflector unit built into one water- and dust-proof pre-focused unit. 1955 G. Oster in R. C. Mellors Analyt. Cytol. ix. 9/3 The development of their prefocused x-ray tube. 1992 Police June 23 (advt.) You need to know that every time you reach for your flashlight, it has a fresh, full charge and a blinding, prefocused halogen beam. 2002 Physics of Plasmas 9 3617 A high quality prefocused seed pulse is shown to remain well-focused through the entire process of the seed amplification. This is a new entry (OED Third Edition, March 2007; most recently modified version published online March 2022). < adj.1939
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