acuo, = to make sharp or pointed, to sharpen, whet;
acumen, acuminis, = a point;
-inus, = indicates possession or likeness;
-atus, = indicates possession or likeness.
(acuminate; tapering gradually or abruptly from inwardly curved sides into a narow point, sharpened) (ld, BL)
lux, lucis, = light;
luceo, = to be light or clear, to shine, beam, glitter;
-idus, = indicates a state or an action in progress.
lucidus, = containing light, full of light, clear, bright, shining.
(shining, clear, transparent) (ld, BL)