| AUTOCHTHONISM | • autochthonism n. The state of being autochthonal. • AUTOCHTHONISM n. the condition of being autochthonous. |
| HARMONICHORDS | • harmonichords n. Plural of harmonichord. • HARMONICHORD n. a keyboard instrument of violin tone, in which the strings are rubbed by rosined wheels. |
| HARMONIPHONES | • harmoniphones n. Plural of harmoniphone. • HARMONIPHONE n. a keyboard wind instrument with reeds, also HARMONIPHON. |
| HELMINTHOLOGY | • helminthology n. (Zoology) The branch of zoology related to the study of helminths (parasitic worms). • HELMINTHOLOGY n. the study of parasitic worms. |
| HOMEOWNERSHIP | • homeownership n. The state of being a homeowner. • home␣ownership n. The ownership of a home, (or collectively) homes. • home␣ownership n. The situation of owning one’s home. |
| HOMESCHOOLING | • homeschooling n. Teaching children at home instead of sending them to school. • home␣schooling v. Present participle of home school. • HOMESCHOOL v. to teach school subjects to one's children at home. |
| HONEYMONTHING | • HONEYMONTH v. (obsolete) to spend one's honeymoon, also HONEYMOON. |
| HYPOCHONDRIUM | • hypochondrium n. (Anatomy) The upper region of the abdomen, below the lower ribs, each side of the epigastrium. • HYPOCHONDRIUM n. either of two regions of the upper part of the abdomen. |
| ORNITHOMORPHS | • ornithomorphs n. Plural of ornithomorph. • ORNITHOMORPH n. a figure or design in the form of a bird. |
| ORTHOGNATHISM | • orthognathism n. (Anatomy) The quality of being orthognathous. • ORTHOGNATHISM n. the state of having straight jaws. |
| PHOTOMACHINES | • PHOTOMACHINE n. a machine that prints copies of digital photographs. |
| THERMOSIPHONS | • thermosiphons n. Plural of thermosiphon. • THERMOSIPHON n. a method of circulating a cooling liquid through a system by using the slight difference in density between the hot and cool parts. |
| XANTHOCHROISM | • xanthochroism n. Alternative form of xanthochromism. • XANTHOCHROISM n. a condition in which all skin pigments except yellow disappear. |
| XANTHOCHROMIA | • xanthochromia n. (Medicine) The yellowish appearance of cerebrospinal fluid that accompanies certain conditions, especially… • XANTHOCHROMIA n. any yellowish discoloration, esp. of the cerebrospinal fluid. |