Definition of "lucida" [lucida]

• A star easily seen by the naked eye, as opposed to a telescopic star; also, the brightest star of a constellation, or the brightest component of a double or multiple star. (noun)

The Century Dictionary (Public Domain)

• "A small aperture in the wall, opposite the seat in which the person is placed whose profile is taken, conceals a camera lucida, which is placed in an adjoining apartment: and an assistant, by moving a point, connected by a pentagraph with the hand of the automaton, over the outline of the head, causes the figure to trace a corresponding profile."
• "And I found that structures in the brain or drawings of the brain I could image with great vividness and then draw almost as if they had been projected by a camera lucida or something like that."
• "And I found that structures in the brain or drawings (ph) of the brain I could image with great vividness and then draw almost as if they had been projected by a camera lucida or something like that."