inquilinism

From ZooTerms (Dictionary of Invertebrate Zoology)
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inquilinism (noun; Latin inquilinus, tenant; -ismus, condition): 1. The relationship between two organisms sharing an abode without benefit or damage to either.

2. (Arthropoda: Insecta) The relationship of a socially parasitic species that spends its entire life cycle in the nest of a host species; workers are either lacking or scarce and degenerate in behavior; permanent parasitism.