13-Letter Words Containing: RAS__

• Pertaining to a taxon at a rank lower than species.

• a soft yellowish-white trivalent metallic element of the rare earth group; can be recovered from bastnasite or monazite by an ion-exchange process

• Any parasite whose host is a parasite.

• (specifically) An insect that parasitizes another parasitic insect.

• a premature systole resulting in a momentary cardiac arrhythmia

• arising or occurring within a species; involving the members of one species