| APOSPOROUS | • aposporous adj. (Botany) relating to apospory. • APOSPOROUS adj. showing apospory, the development of prothalli from direct outgrowths from the fern frond. |
| APOTROPOUS | • APOTROPOUS adj. anatropous with a ventral raphe. |
| LOPHOPHORE | • lophophore n. (Zoology) A feeding organ of brachiopods, bryozoans and phoronids. • LOPHOPHORE n. a ring of ciliated tentacles round the mouth of some sedentary marine animals. |
| OPHIOMORPH | • OPHIOMORPH n. a caecilian amphibian. |
| PHONOPHORE | • phonophore n. The phonetic component of a character in Chinese and related writing systems. • phonophore n. A type of telegraph. • PHONOPHORE n. a sound-conducting apparatus, of various kinds; a device for telephoning and telegraphing simultaneously by the same wire. |
| PHONOPORES | • phonopores n. Plural of phonopore. • PHONOPORE n. a kind of sound-conducting apparatus. |
| PHOTOPHORE | • photophore n. (Biology) A light-emitting organ, found in some fish and other marine animals. • photophore n. (Medicine) A form of endoscope using an electric light. • PHOTOPHORE n. a luminiferous organ. |
| PHOTOTROPE | • PHOTOTROPE n. a substance exhibiting phototropism, movement directed by light. |
| PHOTOTROPH | • phototroph n. A photoautotroph. • PHOTOTROPH n. a plant which uses light to generate energy needed to absorb nutrients. |
| PHOTOTROPY | • phototropy n. Phototropism. • PHOTOTROPY n. change of colour due to wavelength of incident light. |
| PORNOTOPIA | • pornotopia n. A fantasy world in which everyone is ready and willing to indulge in all kinds of sexual activity. • PORNOTOPIA n. a perfect setting for the antics of pornography. |
| POROSCOPES | • poroscopes n. Plural of poroscope. • POROSCOPE n. an instrument for investigating porosity. |
| POROSCOPIC | • poroscopic adj. Relating to poroscopy. • POROSCOPIC adj. relating to a poroscope, an instrument for investigating porosity. |
| PROMPTBOOK | • promptbook n. An annotated copy of a script used by a prompter. • PROMPTBOOK n. a copy of a play for a prompter. |
| PROPODEONS | • PROPODEON n. in some Hymenoptera, the first abdominal segment, also PROPODEUM. |
| PROPORTION | • proportion n. (Countable) A quantity of something that is part of the whole amount or number. • proportion n. (Uncountable) Harmonious relation of parts to each other or to the whole. • proportion n. (Countable) Proper or equal share. |
| PROPROCTOR | • proproctor n. (UK) An assistant proctor in a university. • PROPROCTOR n. an assistant proctor. |
| PROTOTROPH | • prototroph n. (Biology) Any microorganism that can synthesize its nutrients from inorganic material. • PROTOTROPH n. a bacterium feeding only on inorganic matter. |
| SPOROPHORE | • sporophore n. A spore-producing organ, especially a fungus hypha specialized to carry spores. • sporophore n. A sporophyte, or spore-producing plant. • SPOROPHORE n. a spore-bearing stalk or structure, as in fungi. |