Alternative form of super-superlative

plural of spuriousness

(biochemistry) Any of several light-sensitive flavoproteins, involved in the circadian rhythms of plants and animals, and possibly also in the sensing of magnetic fields.

(ichthyology) Of a fish's tail, such that the vertebral column bends and extends upwards into the upper lobe of the tail, making it larger than the lower lobe; as in sharks, rays, and skates.