sensillum
noun
sen·sil·lum sen-ˈsi-ləm 
variants or less commonly sensilla
sen-ˈsi-lə
plural sensilla sen-ˈsi-lə also sensillae sen-ˈsi-(ˌ)lē
also sensillae sen-ˈsi-(ˌ)lē : a simple epithelial sense organ of an invertebrate (such as an insect) usually in the form of a spine, plate, rod, cone, or peg that is composed of one or a few cells with a nerve connection
Word History
Etymology
New Latin sensillum, diminutive of Medieval Latin sensus sense organ, from Latin, sense
First Known Use
1882, in the meaning defined above