| ATTOSECONDS | • attoseconds n. Plural of attosecond. • ATTOSECOND n. ten to the power of minus eighteen seconds. |
| CETOLOGISTS | • cetologists n. Plural of cetologist. • CETOLOGIST n. one versed in cetology. |
| COSTOTOMIES | • COSTOTOMY n. surgical incision into a rib. |
| COTTONSEEDS | • cottonseeds n. Plural of cottonseed. • COTTONSEED n. the seed of the cotton plant, yielding a valuable oil. |
| CYSTOTOMIES | • cystotomies n. Plural of cystotomy. • CYSTOTOMY n. surgical incision into the bladder. |
| ECOTOURISTS | • ecotourists n. Plural of ecotourist. • ECOTOURIST n. a tourist who visits areas of ecological interest (typically exotic and often threatened natural environments), esp. to help conservation efforts and observe wildlife. |
| OSTEOCLASTS | • osteoclasts n. Plural of osteoclast. • OSTEOCLAST n. an instrument used in osteoclasis. |
| SCOOTERISTS | • scooterists n. Plural of scooterist. • SCOOTERIST n. one who rides a scooter. |
| SCOTOMETERS | • scotometers n. Plural of scotometer. • SCOTOMETER n. an instrument for detecting defects in the visual field. |
| STATOSCOPES | • statoscopes n. Plural of statoscope. • STATOSCOPE n. an instrument for measuring small changes in atmospheric pressure. |
| STETHOSCOPE | • stethoscope n. (Medicine) A medical instrument used for listening to sounds produced within the body. • stethoscope v. (Transitive) To auscultate, or examine, with a stethoscope. • STETHOSCOPE n. an instrument with which to listen to the sounds produced by the heart, lungs, etc. |
| STETHOSCOPY | • stethoscopy n. (Medicine) The diagnostic use of a stethoscope. • STETHOSCOPY n. examination with a stethoscope. |
| STOCKROUTES | • STOCKROUTE n. in Australia and New Zealand, a right of way for travelling stock. |
| TOUCHSTONES | • touchstones n. Plural of touchstone. • Touchstones prop.n. Plural of Touchstone. • TOUCHSTONE n. a highly siliceous (usually black) stone or other stone for testing gold or silver by the colour of the mark each makes on it; (figurative) a criterion, a standard. |