| BUTTONHOLDING | • BUTTONHOLD v. to detain in talk, also BUTTONHOLE. |
| ESCHATOLOGIST | • eschatologist n. One who practises eschatology. • ESCHATOLOGIST n. a specialist in eschatology. |
| HAEMATOLOGIST | • haematologist n. A scientist, usually a medical doctor, who specializes in haematology. • hæmatologist n. Obsolete form of hematologist. • HAEMATOLOGIST n. a specialist in haematology, also HEMATOLOGIST. |
| HEMATOLOGISTS | • hematologists n. Plural of hematologist. • HEMATOLOGIST n. a specialist in hematology, also HAEMATOLOGIST. |
| HEORTOLOGISTS | • heortologists n. Plural of heortologist. • HEORTOLOGIST n. one who practises heortology, the study of religious feasts. |
| HEPATOLOGISTS | • hepatologists n. Plural of hepatologist. • HEPATOLOGIST n. a specialist in liver diseases. |
| HERPETOLOGIST | • herpetologist n. One who studies reptiles and amphibians; a reptile and amphibian specialist. • HERPETOLOGIST n. one who studies snakes. |
| ICHTHYOLOGIST | • ichthyologist n. An expert in ichthyology: one who studies fishes. • ICHTHYOLOGIST n. one who studies ichthyology. |
| METHODOLOGIST | • methodologist n. A person who studies methodology, or applies its principles. • METHODOLOGIST n. a student of methodology. |
| ORNITHOLOGIST | • ornithologist n. A person who studies or practices ornithology. • ORNITHOLOGIST n. one who studies birds. |
| ORTHOGONALITY | • orthogonality n. (Mathematics, statistics, software engineering) The property of being orthogonal. • ORTHOGONALITY n. the state of being orthogonal. |
| PANTHEOLOGIST | • pantheologist n. One versed in pantheology. • PANTHEOLOGIST n. a specialist in pantheology. |
| PHOTOGELATINE | • PHOTOGELATINE adj. another name for collotype, a method of printing illustrations from hardened gelatin film. |
| TECHNOLOGISTS | • technologists n. Plural of technologist. • TECHNOLOGIST n. one versed in technology. |
| THANATOLOGIES | • thanatologies n. Plural of thanatology. • THANATOLOGY n. the description or study of the phenomena of death and of psychological mechanisms for coping with them. |
| THANATOLOGIST | • thanatologist n. One who studies death. • THANATOLOGIST n. one who studies thanatology. |
| TRICHOLOGISTS | • trichologists n. Plural of trichologist. • TRICHOLOGIST n. a person who specializes in hair and scalp care. |