| CHLORINATORS | • chlorinators n. Plural of chlorinator. • CHLORINATOR n. a machine for chlorinating. |
| COINHERITORS | • coinheritors n. Plural of coinheritor. • COINHERITOR n. a joint inheritor. |
| CORONERSHIPS | • coronerships n. Plural of coronership. • CORONERSHIP n. the office of coroner. |
| DISHONOURERS | • dishonourers n. Plural of dishonourer. • DISHONOURER n. one who dishonours, also DISHONORER. |
| GOVERNORSHIP | • governorship n. The office, or the term of a governor. • GOVERNORSHIP n. the office of governor. |
| ORCHESTRIONS | • orchestrions n. Plural of orchestrion. • ORCHESTRION n. a name given to various keyboard or barrel organ instruments designed to imitate an orchestra, also ORCHESTRINA. |
| ORNITHOPTERS | • ornithopters n. Plural of ornithopter. • ORNITHOPTER n. a birdlike archaic flying machine. |
| ORNITHOSAURS | • ORNITHOSAUR n. a pterodactyl. |
| PORPHYROPSIN | • porphyropsin n. Any of a group of purple carotenoid pigments, similar to rhodopsin, in the retinas of some fish. • PORPHYROPSIN n. a purple pigment in the retinal rods of freshwater fishes that resembles rhodopsin. |
| PROCHRONISMS | • prochronisms n. Plural of prochronism. • PROCHRONISM n. assigning a date to an event earlier than actual. |
| PROTHROMBINS | • prothrombins n. Plural of prothrombin. • PROTHROMBIN n. a protein-like substance present in blood plasma. |
| RHINOCEROSES | • rhinoceroses n. Plural of rhinoceros. • RHINOCEROS n. a large heavy ungulate mammal of the perissodactyl family Rhinocerotidae, also RHINOCEROT, RHINOCEROTE. |
| RHINOCEROTES | • rhinocerotes n. (Now rare) plural of rhinoceros. • rhinocerotes n. (Archaic) plural of rhinocerot. • rhinocerotes n. Plural of rhinocerote. |
| RHINORRHOEAS | • rhinorrhoeas n. Plural of rhinorrhoea. • RHINORRHOEA n. continuous nasal catarrh. |
| THYROTROPINS | • thyrotropins n. Plural of thyrotropin. • THYROTROPIN n. a hormone, produced in the anterior lobe of the pituitary gland, which stimulates the thyroid, also THYROTROPHIN. |
| TRICHLORFONS | • TRICHLORFON n. a crystalline compound used esp. as an insecticide, also TRICHLORPHON. |