(ornithology) A species utilised by a brood parasite to raise young.

plural of species-monger

(derogatory) A biologist who is overly concerned with narrow classification, indifferent to wider relationships.

(pathology, zoology) The inability of a disease to be transmitted from one species to a different one.

plural of species barrier

(taxonomy) Synonym of speciose

The four plant-parts shaken as a unit on Sukkot

plural of species problem

The problem of finding a concept of a taxonomic species that can be usefully applied to many very different types of organism.

(chemistry) Any peroxide, singlet oxygen or similar material that is a reactive oxidizing agent