- a marine invertebrate which superficially resembles a bivalve mollusc but has two or more arms of ciliated tentacles (lophophores) that are extended for filter-feeding. Lamp shells are common as fossils. Also called brachiopod.
- Phylum Brachiopoda: numerous groups in the Palaeozoic era but few surviving to the present day
mid 19th century: from its resemblance to an ancient oil lamp