[mal-uh-kos-truh-kuh n]
  1. belonging or pertaining to the crustacean subclass Malacostraca, which includes the lobsters, shrimps, crabs, etc.
  1. a malacostracan crustacean.

Origin of malacostracan

1825–35; < New Latin Malacostrac(a) order of crustacea (< Greek, neuter plural of malakóstrakos soft-shelled, equivalent to malak- malaco- + -ostrakos, adj. derivative of óstrakon shell (of mollusks, etc.); cf. ostracize) + -an Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for malacostracan

Historical Examples of malacostracan

British Dictionary definitions for malacostracan


  1. any crustacean of the subclass or group Malacostraca, including lobsters, crabs, woodlice, sand hoppers, and opossum shrimps
adjective Also: malacostracous
  1. of, relating to, or belonging to the Malacostraca

Word Origin for malacostracan

C19: from New Latin, from Greek malakōstrakos, from malaco- + ostrakon shell
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012