Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ē-lūcus, i, m. [lux].
Prop., one who has been awake all night; hence, a drowsy or dreaming person, Gell. 4, 19, 1; cf. id. 16, 12, 3; Tert. Cor. Mil. 7; cf. Paul. ex Fest. p. 75, 17 Müll.