Entrance-pupil


noun, Optics.
1.
the image of the aperture viewed from the objective of an optical system limiting the rays that enter the system.

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    [en-tran-sing, -trahn-] /ɛnˈtræn sɪŋ, -ˈtrɑn-/ adjective 1. delightful; enchanting. [en-trans, -trahns] /ɛnˈtræns, -ˈtrɑns/ verb (used with object), entranced, entrancing. 1. to fill with delight or wonder; enrapture. 2. to put into a : to be hypnotically entranced. /ˈɛntrəns/ noun 1. the act or an instance of entering; entry 2. a place for entering, such as […]

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    [en-truh nt] /ˈɛn trənt/ noun 1. a competitor in a contest. 2. a new member, as of an association or school. 3. a person who . /ˈɛntrənt/ noun 1. a person who enters 2. a new member of a group, society, or association 3. a person who enters a competition or contest; competitor n. 1630s, […]


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