| COSMOSPHERES | • cosmospheres n. Plural of cosmosphere. • COSMOSPHERE n. an apparatus for showing the position of the earth at any given time with reference to the fixed stars. |
| HELMSPERSONS | • helmspersons n. Plural of helmsperson. |
| ISOMORPHISMS | • isomorphisms n. Plural of isomorphism. • ISOMORPHISM n. similarity in shape or structure in unrelated forms. |
| MESOHIPPUSES | • MESOHIPPUS n. an extinct mammal of the Horse family. |
| MOPISHNESSES | • MOPISHNESS n. the state of being mopish. |
| OARSMANSHIPS | • OARSMANSHIP n. the craft of rowing with oars. |
| PHOSPHORISMS | • PHOSPHORISM n. (obsolete) chronic phosphorus poisoning. |
| PHOTOSYSTEMS | • photosystems n. Plural of photosystem. • PHOTOSYSTEM n. either of two photochemical reaction centers consisting chiefly of photosynthetic pigments complexed with protein and occurring in chloroplasts. |
| PHYSOSTOMOUS | • physostomous adj. (Zoology) Having a duct to the air bladder. • physostomous adj. (Zoology) Relating to the Physostomi. • PHYSOSTOMOUS adj. of fishes, having a duct connecting the air bladder to part of the alimentary canal. |
| SCYPHISTOMAS | • scyphistomas n. Plural of scyphistoma. • SCYPHISTOMA n. the fixed polypoid stage in the life cycle of a scyphozoan, which reproduces asexually by budding or strobilation. |
| SEISMOGRAPHS | • seismographs n. Plural of seismograph. • SEISMOGRAPH n. an instrument for recording earthquakes. |
| SHOPAHOLISMS | • SHOPAHOLISM n. an addiction to shopping. |
| SHOWMANSHIPS | • showmanships n. Plural of showmanship. • SHOWMANSHIP n. skilful display, or a talent for it. |
| SYMPOSIARCHS | • symposiarchs n. Plural of symposiarch. • SYMPOSIARCH n. the master, director, etc. of a feast or conference. |
| THEOSOPHISMS | • THEOSOPHISM n. theosophical tenets. |