focal
(adjective) having or localized centrally at a focus; “focal point”; “focal infection”
focal
(adjective) of or relating to a focus; “focal length”
Source: WordNet® 3.1
focal (not comparable)
Belonging to, concerning, or located at a focus
(medicine) limited to a small area
focal (plural focals)
(geometry, obsolete)
Source: Wiktionary
Fo"cal, a. Etym: [Cf.F. focal. See Focus.]
Definition: Belonging to,or concerning, a focus; as, a focal point. Focal distance, or length,of a lens or mirror (Opt.), the distance of the focus from the surface of the lens or mirror, or more exactly, in the case of a lens, from its optical center. --Focal distance of a telescope, the distance of the image of an object from the object glass.
Source: Webster’s Unabridged Dictionary 1913 Edition
23 December 2024
(noun) Australian tree having hard white timber and glossy green leaves with white flowers followed by one-seeded glossy blue fruit
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