| ASTROCHEMISTRY | • astrochemistry n. (Chemistry, astronomy) The study of the chemical composition of stars and outer space. • ASTROCHEMISTRY n. the study of molecules and radicals in outer space. | 
| BRACHYPTERISMS | • BRACHYPTERISM n. the state of having abnormally short wings. | 
| DYSMENORRHOEAS | • dysmenorrhoeas n. Plural of dysmenorrhoea. • dysmenorrhœas n. Plural of dysmenorrhœa. • DYSMENORRHOEA n. painful menstruation, also DYSMENORRHEA. | 
| HETEROKARYOSES | • HETEROKARYOSIS n. the condition of having cells that are heterokaryons. | 
| HETEROKARYOSIS | • heterokaryosis n. (Biology) The condition of being a heterokaryon. • HETEROKARYOSIS n. the condition of having cells that are heterokaryons. | 
| HYPERALERTNESS | • hyperalertness n. The condition of being hyperalert. | 
| HYPERAWARENESS | • hyperawareness n. The state of being hyperaware, or extremely sensitive to stimuli. • HYPERAWARENESS n. the state of being hyperaware. | 
| HYPERKERATOSES | • hyperkeratoses n. Plural of hyperkeratosis. • HYPERKERATOSIS n. hypertrophy of the horny layer of the skin. | 
| HYPERKERATOSIS | • hyperkeratosis n. (Pathology) Excess keratin formation on the skin surface, as can be seen in a number of dermatologic conditions. • HYPERKERATOSIS n. hypertrophy of the horny layer of the skin. | 
| HYPERPARASITES | • hyperparasites n. Plural of hyperparasite. • HYPERPARASITE n. a parasite that is parasitic upon another parasite. | 
| HYPERPOLARISES | • hyperpolarises v. Third-person singular simple present indicative form of hyperpolarise. • HYPERPOLARISE v. to increase the difference in electric potential across a cell membrane, also HYPERPOLARIZE. | 
| HYPERPROSEXIAS | • HYPERPROSEXIA n. abnormal powers of perception, as in Australian aboriginal trackers. | 
| HYPERURBANISMS | • hyperurbanisms n. Plural of hyperurbanism. • HYPERURBANISM n. use of hypercorrect forms in language. | 
| OYSTERCATCHERS | • oystercatchers n. Plural of oystercatcher. • OYSTERCATCHER n. a black and white wading bird, with red bill and feet, feeding on limpets and mussels (not oysters). | 
| PHYSIOGRAPHERS | • physiographers n. Plural of physiographer. • PHYSIOGRAPHER n. one who practises physiography. | 
| SECRETARYSHIPS | • secretaryships n. Plural of secretaryship. • SECRETARYSHIP n. the office of secretary. | 
| SPHAEROCRYSTAL | • sphaerocrystal n. Alternative form of spherocrystal. • SPHAEROCRYSTAL n. a rounded crystalline mass. | 
| TRACHYPTERUSES | • TRACHYPTERUS n. any member of the dealfish genus Trachypterus. |