| DITHYRAMBIST | • DITHYRAMBIST n. one who sings dithyrambic hymns. |
| DYNAMOGRAPHS | • dynamographs n. Plural of dynamograph. • DYNAMOGRAPH n. an instrument for recording mechanical forces. |
| DYSMENORRHEA | • dysmenorrhea n. (Medicine) Painful menstruation (menstrual#Adjective pain), viewed as a symptom#Noun in any of various disorders. • dysmenorrhea n. (Medicine) Painful menstruation (menstrual#Adjective pain), viewed as a disorder#Noun in its own right… • DYSMENORRHEA n. painful menstruation, also DYSMENORRHOEA. |
| DYSRHYTHMIAS | • dysrhythmias n. Plural of dysrhythmia, which can refer to types of dysrhythmia, cases of dysrhythmia, or episodes of dysrhythmia. • DYSRHYTHMIA n. an abnormal rhythm. |
| HEADMASTERLY | • headmasterly adj. In a manner befitting a headmaster. • HEADMASTERLY adj. like a headmaster. |
| HEMIHYDRATES | • hemihydrates n. Plural of hemihydrate. • HEMIHYDRATE n. a hydrate, such as plaster of paris, containing half a mole of water to one mole of the compound forming the hydrate. |
| HYDRARGYRISM | • hydrargyrism n. (Medicine) A diseased condition produced by poisoning with hydrargyrum, or mercury; mercurialism. • HYDRARGYRISM n. mercury poisoning, also HYDRARGYRIA. |
| HYDRARGYRUMS | • HYDRARGYRUM n. an obsolete name for mercury. |
| HYDROMANCERS | • hydromancers n. Plural of hydromancer. • HYDROMANCER n. one who practises hydromancy. |
| HYDROMANCIES | • hydromancies n. Plural of hydromancy. • HYDROMANCY n. divination by the appearance or motion of liquids (as water). |
| HYDROMASSAGE | • hydromassage n. A therapeutic massage in which bubbles of air and jets of water are pumped through a bath in which the recipient lies. • hydromassage v. (Transitive) To massage in this way. |
| HYDROMEDUSAE | • hydromedusae n. Plural of hydromedusa. • HYDROMEDUSA n. a hydrozoan in its medusoid stage, also HYDROMEDUSAN, HYDROMEDUSOID. |
| HYDROMEDUSAN | • hydromedusan adj. (Zoology) Relating to the hydromedusas. • HYDROMEDUSAN n. a hydromedusa, also HYDROMEDUSA, HYDROMEDUSOID. |
| HYDROMEDUSAS | • hydromedusas n. Plural of hydromedusa. • HYDROMEDUSA n. a hydrozoan in its medusoid stage, also HYDROMEDUSAN, HYDROMEDUSOID. |
| MONOHYDRATES | • monohydrates n. Plural of monohydrate. • MONOHYDRATE n. a hydrate containing one molecule of water per molecule of the compound. |
| PACHYDERMIAS | • PACHYDERMIA n. elephantiasis. |
| PACHYDERMOUS | • PACHYDERMOUS adj. thick-skinned, also PACHYDERMATOUS. |
| PSYCHODRAMAS | • psychodramas n. Plural of psychodrama. • PSYCHODRAMA n. therapeutic drama. |
| RHABDOMYOMAS | • rhabdomyomas n. Plural of rhabdomyoma. • RHABDOMYOMA n. a tumour of striated muscle. |