| DIPHTHONGALLY | • diphthongally adv. By means of a diphthong. • DIPHTHONGAL adv. of or like a diphthong. |
| HELMINTHOLOGY | • helminthology n. (Zoology) The branch of zoology related to the study of helminths (parasitic worms). • HELMINTHOLOGY n. the study of parasitic worms. |
| HIEROGLYPHING | • hieroglyphing v. Present participle of hieroglyph. • HIEROGLYPH v. to represent by hieroglyphs. |
| HONEYMONTHING | • HONEYMONTH v. (obsolete) to spend one's honeymoon, also HONEYMOON. |
| HYMNOGRAPHIES | • HYMNOGRAPHY n. the study of writing hymns. |
| HYPERCHARGING | • HYPERCHARGE v. to charge excessively, to overload. |
| HYPERPHRYGIAN | • HYPERPHRYGIAN adj. above the Phrygian; applied to a mode of ancient Greek music having as its lower tetrachord the upper tetrachord of the Phrygian. |
| HYPNOBIRTHING | • hypnobirthing n. The use of hypnotherapy to ease the process of childbirth. • HYPNOBIRTHING n. the use of hypnotic technique during labour by an expectant mother to reduce the pain and emotional stress of delivery. |
| HYPOGNATHISMS | • HYPOGNATHISM n. the state of being hypognathous. |
| HYPOTHECATING | • hypothecating v. Present participle of hypothecate. • HYPOTHECATE v. to pledge as security without title or possession. |
| HYPOTHESISING | • hypothesising v. Present participle of hypothesise. • HYPOTHESISE v. to form a hypothesis, also HYPOTHESIZE, HYPOTHETISE, HYPOTHETIZE. |
| HYPOTHESIZING | • hypothesizing v. Present participle of hypothesize. • HYPOTHESIZE v. to make a hypothesis, also HYPOTHESISE, HYPOTHETISE, HYPOTHETIZE. |
| HYPOTHETISING | • hypothetising v. Present participle of hypothetise. • HYPOTHETISE v. to form a hypothesis, also HYPOTHESISE, HYPOTHESIZE, HYPOTHETIZE. |
| HYPOTHETIZING | • hypothetizing v. Present participle of hypothetize. • HYPOTHETIZE v. to form a hypothesis, also HYPOTHESISE, HYPOTHESIZE, HYPOTHETISE. |
| NIGHTMARISHLY | • nightmarishly adv. In a nightmarish manner. • NIGHTMARISH adv. like a nightmare, also NIGHTMARY. |
| ONYCHOPHAGIES | • ONYCHOPHAGY n. the habit of biting one's fingernails. |
| ONYCHOPHAGIST | • onychophagist n. (Rare) A person who bites his or her fingernails. • ONYCHOPHAGIST n. one who bites their fingernails. |
| WHILLYWHAWING | • WHILLYWHAW v. (Scots) to coax, wheedle, cajole, also WHILLYWHA. |