| ARCHDUKEDOM | • archdukedom n. The territory or dignity of an archduke or archduchess; an archduchy. • ARCHDUKEDOM n. the domain of an archduke. |
| DIATHERMOUS | • diathermous adj. Freely permeable by radiant heat. • DIATHERMOUS adj. permeable to or able to conduct radiant heat, also DIATHERMIC. |
| DINOTHERIUM | • dinotherium n. An extinct animal of large size, with elephant-like tusks curved down from its lower jaw. • DINOTHERIUM n. an extinct elephantine mammal with downward-curving tusks, also DEINOTHERE, DEINOTHERIUM, DINOTHERE. |
| DISHUMOURED | • dishumoured v. Simple past tense and past participle of dishumour. • DISHUMOUR v. (obsolete) to put out of humour. |
| HARDMOUTHED | • hard-mouthed adj. Not sensitive to the bit; not easily governed. • hard-mouthed adj. Hard-featured about the mouth. • HARDMOUTHED adj. of a horse, with a mouth insensible to the bit; not easily managed. |
| HUMDURGEONS | • HUMDURGEON n. an imaginary illness. |
| HYDROMEDUSA | • hydromedusa n. The South American snake-necked turtle. • HYDROMEDUSA n. a hydrozoan in its medusoid stage, also HYDROMEDUSAN, HYDROMEDUSOID. |
| HYDROXONIUM | • hydroxonium n. (Chemistry) The cation obtained by reacting a proton with water - H3O+; hydronium. • HYDROXONIUM n. the obsolete name for the cation H3O+ derived from protonation of water. |
| MOUTHGUARDS | • mouthguards n. Plural of mouthguard. • mouth␣guards n. Plural of mouth guard. |
| OPHIDIARIUM | • ophidiarium n. A place for keeping snakes. • OPHIDIARIUM n. a snake-house. |
| OUTHUMOURED | • outhumoured v. Simple past tense and past participle of outhumour. • OUTHUMOUR v. to surpass in humoring, also OUTHUMOR. |
| POORMOUTHED | • poormouthed v. Simple past tense and past participle of poormouth. • POORMOUTH v. to complain about being poor. |
| PSEUDOMORPH | • pseudomorph n. A deceptive, irregular, or false form; specifically… • pseudomorph v. To be transformed into such a form. • PSEUDOMORPH n. a false or abnormal physical form. |
| RHOMBOIDEUS | • rhomboideus n. (Anatomy) Any of the rhomboid muscles. • RHOMBOIDEUS n. a rhomboid, also RHOMBOIDES. |
| SHUDDERSOME | • shuddersome adj. Causing one to shudder; fearsome. • SHUDDERSOME adj. causing one to shudder. |
| THERMODURIC | • thermoduric adj. (Of bacteria) Capable of surviving high temperatures such as the pasteurisation process. • thermoduric n. A bacterium capable of surviving high temperatures. • THERMODURIC adj. resistant to high temperatures. |