n. Plural of seraph.n. In entomology, the geometrid moth Lobophora halterata, or L. hexaptera: an English collectors' name. The small seraphim is L. sexalisata.n. A fossil crustacean of the genus Pterygotus, as P. anglicus: said to be so called by Scotch quarrymen, from some fancied resemblance of the creatures to their notion of seraphs.