| AEROHYDROPLANE | • AEROHYDROPLANE n. a winged hydroplane or flying-boat. |
| EPHEMEROPTERAN | • ephemeropteran n. (Zoology) Any insect of the order Ephemeroptera, the mayflies. • EPHEMEROPTERAN n. any insect of the mayfly family. |
| 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. |
| HYPERNATRAEMIA | • hypernatraemia n. Alternative form of hypernatremia. • HYPERNATRAEMIA n. an abnormally high concentration of sodium chloride (salt) in the blood, esp. in infants. |
| HYPOMENORRHEAS | • hypomenorrheas n. Plural of hypomenorrhea. • HYPOMENORRHEA n. the condition in which the interval between two menstrual periods is increased to between 35 and 42 days, also HYPOMENORRHOEA. |
| HYPOMENORRHOEA | • hypomenorrhoea n. Alternative form of hypomenorrhea. • HYPOMENORRHOEA n. the condition in which the interval between two menstrual periods is increased to between 35 and 42 days, also HYPOMENORRHEA. |
| OCEANOGRAPHERS | • oceanographers n. Plural of oceanographer. • OCEANOGRAPHER n. one who maps the oceans. |
| PARTHENOSPORES | • PARTHENOSPORE n. a thick-walled spore produced by parthenogenesis in certain algae and fungi. |
| PERENNIBRANCHS | • perennibranchs n. Plural of perennibranch. • PERENNIBRANCH n. a creature that retains the gills throughout life. |
| PHOTOENGRAVERS | • photoengravers n. Plural of photoengraver. • PHOTOENGRAVER n. one who does photoengraving. |
| RAPPROCHEMENTS | • rapprochements n. Plural of rapprochement. • RAPPROCHEMENT n. (French) a resumption of or improvement in relations between countries or persons. |
| ROENTGENOGRAPH | • roentgenograph n. A radiograph. • roentgenograph v. To radiograph. • ROENTGENOGRAPH n. an X-ray photograph, also RONTGENOGRAPH. |
| SELENOGRAPHERS | • selenographers n. Plural of selenographer. • SELENOGRAPHER n. one who maps the moon, also SELENOGRAPHIST. |
| STEGANOGRAPHER | • steganographer n. One that practices or studies steganography. • STEGANOGRAPHER n. a cryptographer; one who works with ciphers. |
| STEREOGRAPHING | • stereographing v. Present participle of stereograph. • STEREOGRAPH v. to make a stereograph. |
| SUPERHARDENING | • superhardening v. Present participle of superharden. • SUPERHARDEN v. to harden to extremes. |
| TRAPEZOHEDRONS | • trapezohedrons n. Plural of trapezohedron. • TRAPEZOHEDRON n. a crystalline form whose faces are trapeziums. |
| WEATHERPERSONS | • weatherpersons n. Plural of weatherperson. • WEATHERPERSON n. a person who reports and forecasts the weather. |
| WHIPPERSNAPPER | • whippersnapper n. (Colloquial, dated) A young and cheeky or presumptuous person. • whipper-snapper n. Alternative form of whippersnapper. • whipper␣snapper n. Alternative form of whippersnapper. |