boss
From ZooTerms (Dictionary of Invertebrate Zoology)
boss (noun; plural bosses; French bosse, hump): 1. Any protruberant part, prominence or swelling.
2. (Arthropoda: Chelicerata) In Arachnida, a smooth lateral prominence at the base of a chelicera of spiders.
3. (Arthropoda: Crustacea) An umbo.
4. (Arthropoda: Insecta) In Diptera, a sclerotized, elevated area at the base of the ventral brush in certain Culicidae larvae.
5. (Echinodermata: Echinoidea) The base of a spine on a sea urchin test.
6. (Mollusca: Gastropoda) A rounded elevation of a shell, larger than a tubercle.
