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focal 音标拼音: [f'okəl] a. 焦点的,在焦点上的 焦点的,在焦点上的 focal焦点 focal adj 1: having or localized centrally at a focus; " focal point"; " focal infection" 2: of or relating to a focus; " focal length" Focal \ Fo" cal\, a. [ Cf. F. focal. See { Focus}.] Belonging to, or concerning, a focus; as, a focal point. [ 1913 Webster] { 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. [ 1913 Webster] 66 Moby Thesaurus words for " focal": approaching, arch, asymptotic, banner, basic, bedrock, capital, cardinal, central, centralized, centred, centripetal, centrolineal, champion, chief, concentrated, concurrent, confluent, confocal, connivent, convergent, converging, crowning, dominant, essential, first, foremost, fundamental, great, headmost, hegemonic, indispensable, leading, life- and- death, life- or- death, magisterial, main, master, material, meeting, mutually approaching, of vital importance, overruling, paramount, predominant, preeminent, preponderant, prevailing, primal, primary, prime, principal, radial, radiating, ranking, ruling, sovereign, star, stellar, substantive, supereminent, tangent, tangential, topflight, uniting, vital
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