| ANORTHITES | • anorthites n. Plural of anorthite. • ANORTHITE n. a plagioclase feldspar, calcium aluminium silicate. |
| BIRTHSTONE | • birthstone n. Any of twelve gemstones traditionally associated with the month of one’s birth. • birthstone n. Any of a similar list of less costly substitutes. • BIRTHSTONE n. a gemstone associated symbolically with the month of one's birth. |
| FORTNIGHTS | • fortnights n. Plural of fortnight. • FORTNIGHT n. a period of two weeks. |
| HATINATORS | • hatinators n. Plural of hatinator. • HATINATOR n. a small decorative hat, worn on social occasions. |
| HORTATIONS | • hortations n. Plural of hortation. • HORTATION n. the act of exhorting. |
| NETHERMOST | • nethermost adj. (Archaic, chiefly literary) Farthest down; lowest. • NETHERMOST adj. lowest. |
| NORTHEASTS | • northeasts n. Plural of northeast. • north-easts n. Plural of north-east. • NORTHEAST n. the direction between north and east. |
| NORTHWESTS | • northwests n. Plural of northwest. • north-wests n. Plural of north-west. • NORTHWEST n. the region between north and west. |
| ORTHOTONES | • ORTHOTONE n. an orthotone word. |
| PHYTOTRONS | • phytotrons n. Plural of phytotron. • PHYTOTRON n. an apparatus that produces climates artificially for the study of plant growth. |
| POTHUNTERS | • pothunters n. Plural of pothunter. • POTHUNTER n. someone who hunts for the pot; someone who competes merely to get trophies. |
| SHIRTFRONT | • shirtfront n. The front part of a shirt. • shirtfront n. A detachable insert that simulates the front of a shirt. • shirtfront n. (Cricket) A pitch that is easy to bat on. |
| STENOTHERM | • stenotherm n. (Biology) An organism, often specifically an ectotherm, that functions only within a narrow temperature range. • STENOTHERM n. an organism capable of surviving over only a narrow range of temperatures. |
| THORNTAILS | • thorntails n. Plural of thorntail. • THORNTAIL n. a tropical American hummingbird with bright green plumage. |
| THORNTREES | • THORNTREE n. any tree bearing thorns. |
| THRENODIST | • threnodist n. (Rare) A person who writes or says a threnody. • THRENODIST n. one who composes, delivers, or utters, a threnode, or threnody. |
| THYRATRONS | • thyratrons n. Plural of thyratron. • THYRATRON n. a gas-filled valve with a heated cathode, able to carry very high currents. |
| TRIATHLONS | • triathlons n. Plural of triathlon. • TRIATHLON n. a sporting contest consisting of three events held without a break between each, usually swimming, cycling and running. |
| TRILITHONS | • trilithons n. Plural of trilithon. • TRILITHON n. (Greek) a stone monument of two upright and one transverse slab, also TRILITH. |