bombiksia obsolete fu'ivla

x₁ is a member of insect genus Bombyx [silkworms] of subtaxon/type/species/breed x₂

For a looser/layperson term, see siktoldi.

In notes:

siktoldi: x₁ is a silkmoth/silkworm [probably Bombyx] of species/breed/type x₂