. "In the philosoph. lang. of Lucret. (like the Gr. and the Lat. spectrum), the form or image of an object of sense or thought presented to the mind; a representation , idea , conception" . "In the philosoph. lang. of Lucret. (like the Gr. and the Lat. spectrum), the form or image of an object of sense or thought presented to the mind; a representation , idea , conception" . .