*opus*

‖n.; pl. Chorepiscopi [ L., fr. Gr. &unr_;; chw^ros, chw`ra, place, country + &unr_; bishop. Cf. Bishop. ] (Eccl.) A “country” or suffragan bishop, appointed in the ancient church by a diocesan bishop to exercise episcopal jurisdiction in a rural district. [ 1913 Webster ]

n. a genus of birds comprised of pewees, and including the wood pewees Contopus sordidulus and Contopus virens.
Syn. -- genus Contopus. [ WordNet 1.5 ]

n. one of two genera of stilts; they are similar to avocets but with straight bills.
Syn. -- genus Himantopus. [ WordNet 1.5 ]

n. A Eurasian genus of perennial herbs or subshrubs.
Syn. -- genus Hyssopus. [ WordNet 1.5 ]

n. A small genus of nonaromatic herbs of the mint family.
Syn. -- genus Lycopus. [ WordNet 1.5 ]

‖n. [ NL. See Macropod. ] (Zool.) A genus of marsupials including the common kangaroo. [ 1913 Webster ]

n. 1. A great work of art or literature. [ WordNet 1.5 ]

2. The greatest work or achievement of a particular artist, writer, or other individual. [ PJC ]

Inspired by this milieu, [ Max Stirner ] wrote his magnum opus The Ego and Its Own, which was published in November 1844. Svein Nyberg (The Small Max Stirner Web Page, 1988 [ https://web.archive.org/web/19981207014247/http://www.math.uio.no/~solan/stirner/stirner.html ]) [ PJC ]

‖ [ L. See Marmorate, and Opus. ] (Arch.) A kind of hard finish for plasterwork, made of plaster of Paris and marble dust, and capable of taking a high polish. [ 1913 Webster ]

n. A mope; a drone. [ Obs. ] Swift. [ 1913 Webster ]

n. [ NL. See Octopod. ] 1. (Zool.) A genus of eight-armed cephalopods, including numerous species, some of them of large size. See Devilfish. [ 1913 Webster ]

2. (Zool.) Any member of the genus Octopus. [ PJC ]

3. (Fig.) Something resembling an octopus in having numerous controlling arms or branches that reach widely and influence many activities; -- used mostly of organizations, such as diversified corporations. [ PJC ]

‖n.; pl. Opera [ L. See Opera. ] A work; specif. (Mus.), a musical composition. [ 1913 Webster ]

☞ Each composition, or set of pieces, as the composer may choose, is called an opus, and they are numbered in the order of their issue. (Often abbrev. to op.) [ 1913 Webster ]

Opus incertum. [ L. ] (Arch.) See under Incertum. [ 1913 Webster ]

{ } n. [ L. opusculum, dim. of opus work: cf. F. opuscule. ] A small or petty work. [ 1913 Webster ]

‖n.; pl. Opuscula [ L. ] An opuscule. Smart. [ 1913 Webster ]

prop. n. The type genus of the Phalaropidae: the phalaropes.
Syn. -- genus Phalaropus. [ WordNet 1.5 ]