From ZooTerms (Dictionary of Invertebrate Zoology)
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workers (noun, plural; Anglo-Saxon worc, work): (Arthropoda) 1. An individual of the semisocial and eusocial Hymenoptera, nonreproductive, laboring caste. 2. In Isoptera, individuals which lack wings and possess reduced pterothorax, eyes and genital apparatus. 3. In Formicidae, the ordinary sterile female, bearing reduced ovarioles and simplified thorax; includes both minor workers and soldiers in species with two subcastes.