| AMPHIPROTIC | • amphiprotic adj. (Chemistry) Able to both donate and accept a proton, and thus able to react both as an acid and a base; amphoteric. • AMPHIPROTIC adj. having both protophilic (basic) and protogenic (acidic) properties. |
| EPIPHYTOTIC | • epiphytotic adj. Relating to epiphytosis. • EPIPHYTOTIC n. a sudden outbreak of plant disease over extended geographical area. |
| HIPPODAMIST | • HIPPODAMIST n. a horse-tamer. |
| HIPPOLOGIST | • hippologist n. One who studies horses. • HIPPOLOGIST n. a student of horses. |
| HIPPOPOTAMI | • hippopotami n. Plural of hippopotamus. • HIPPOPOTAMUS n. a large African artiodactyl ungulate of aquatic habits. |
| PHOTOPHILIC | • photophilic adj. (Biology) That thrives in bright sunlight. • PHOTOPHILIC adj. light-loving, turning towards the light, also PHOTOPHILOUS. |
| PINCHPOINTS | • pinchpoints n. Plural of pinchpoint. • pinch␣points n. Plural of pinch point. • PINCHPOINT n. a constricted or awkward point, esp. in traffic. |
| PITCHPOLING | • pitchpoling v. Present participle of pitchpole. • PITCHPOLE v. to turn end over end. |
| PORPHYRITIC | • porphyritic adj. Of or pertaining to porphyry. • porphyritic adj. (Geology) Containing large crystals in a fine mass of material. • PORPHYRITIC adj. designating an igneous rock in which large crystals (phenocrysts) are set in a matrix of relatively finer-grained crystals or of glass. |
| PROTOPHILIC | • protophilic adj. (Chemistry) Describing a solvent that can accept protons, and is therefore basic. • PROTOPHILIC adj. having or involving an affinity for hydrogen ions (protons). |
| PSILOPHYTIC | • psilophytic adj. Relating to psilophytes. • PSILOPHYTIC adj. of or like a psilophyte, a kind of extinct plant. |
| TAILHOPPING | • TAILHOPPING n. the act of hopping to lift the tails of the skis off the ground while flexing the knees into a crouching position. |
| TOPOPHILIAS | • TOPOPHILIA n. great love or affection for a particular place. |