(a.) Opaque.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). opacous. Retrieved September 25, 2026, from http://smartdefine.org/opacous/definitions/2038937 |
| Chicago | Webster's. 2011. "opacous" http://smartdefine.org/opacous/definitions/2038937 (accessed September 25, 2026). |
| Harvard | Webster's 2011, opacous, Smart Define, viewed 25 September, 2026, <http://smartdefine.org/opacous/definitions/2038937>. |
| MLA | Webster's. "opacous" 27 May 2011. Web. 25 September 2026. <http://smartdefine.org/opacous/definitions/2038937> |