| HOLOTYPES | • holotypes n. Plural of holotype. • HOLOTYPE n. the original type specimen of an animal or plant. |
| HYPOBLAST | • hypoblast n. (Embryology) A type of tissue that forms from the inner cell mass and later is incorporated into the endoderm. • HYPOBLAST n. the inner or lower layer of the blastoderm. |
| HYPOSTYLE | • hypostyle adj. (Architecture) Having a roof supported on a row of columns. • hypostyle n. (Architecture) A building or chamber whose roof is supported on a row of columns. • HYPOSTYLE adj. having a roof supported by columns. |
| NAPHTHYLS | • naphthyls n. Plural of naphthyl. • NAPHTHYL n. a radical derived from naphthalene. |
| PETTISHLY | • pettishly adv. In a pettish manner; peevishly. • PETTISH adv. sulky, petulant. |
| PHOTOLYSE | • photolyse v. To cause photolysis. • PHOTOLYSE v. to cause photolysis in, also PHOTOLYZE. |
| PHYLETICS | • phyletics n. Phylogeny. • PHYLETICS n. the study of the evolution of species. |
| PHYLLITES | • phyllites n. Plural of phyllite. • PHYLLITE n. a foliated rock, a kind of metamorphosed mudstone. |
| PLATYFISH | • platyfish n. Certain fish of the genus Xiphophorus lacking a sword-like extension of the lower tailfin. • PLATYFISH n. a small tropical fish, also PLATY. |
| POLYMATHS | • polymaths n. Plural of polymath. • POLYMATH n. a person of great and varied learning. |
| SPRIGHTLY | • sprightly adj. Animated, gay, or vivacious; lively, spirited. • sprightly adj. Of a person: full of life and vigour, especially with a light and springy step. • sprightly adj. (Obsolete, rare) Of or relating to a sprite; ghostly, spectral. |
| SYLPHIEST | • SYLPHY adj. like a sylph. |
| TALLYSHOP | • tallyshop n. Alternative form of tally shop. • tally␣shop n. A shop from which the tally trade is conducted. • TALLYSHOP n. a shop where goods are sold on credit to be paid for by instalments. |
| TRIGLYPHS | • triglyphs n. Plural of triglyph. • TRIGLYPH n. an architectural ornament. |
| TYPHLITIS | • typhlitis n. (Pathology) Inflammation of the blind gut. • TYPHLITIS n. inflammation of the caecum. |