fishfly means A mayfly. Lexicurio rates it Sui generis — a strength score of 91 out of 100.
Etymology
From fish + fly.
noun
- A mayfly.
- Any insect in the corydalid subfamily Chauliodinae. Unlike most dobsonflies (subfamily Corydalinae) they don't have the enlarged mandibles typical (at least in the males) of that subfamily.