| a gadget; dingus; thingumbob. |
| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
chromogen chro·mo·gen (krō'mə-jən)
n.
A substance that lacks definite color but may be transformed into a pigment.
A strongly pigment-generating or pigmented organelle, organ, or microorganism.