| AMBROTYPES | • ambrotypes n. Plural of ambrotype. • AMBROTYPE n. a picture taken on a plate of prepared glass, in which the lights are represented in silver, and the shades are produced by a dark background visible through the un-silvered portions of the glass. |
| CRYPTOGAMS | • cryptogams n. Plural of cryptogam. • CRYPTOGAM n. a plant reproducing by spores and not seeds, e.g. ferns, mosses, fungi etc. |
| CRYPTONYMS | • cryptonyms n. Plural of cryptonym. • CRYPTONYM n. a code name or secret name. |
| HYPERMARTS | • hypermarts n. Plural of hypermart. • HYPERMART n. a very large self-service store, also HYPERMARKET. |
| HYPSOMETER | • hypsometer n. An instrument that measures altitude indirectly by measuring the boiling point of water (which varies… • HYPSOMETER n. an instrument for measuring height of trees through triangulation. |
| HYPSOMETRY | • hypsometry n. The measurement of elevation relative to sea level. • HYPSOMETRY n. the art of measuring the heights of places on the earth's surface. |
| PAYMASTERS | • paymasters n. Plural of paymaster. • PAYMASTER n. the official in an organization, government etc. who pays out money. |
| PRESBYTISM | • presbytism n. Presbyopia. • PRESBYTISM n. presbyopia. |
| PRETTYISMS | • prettyisms n. Plural of prettyism. • PRETTYISM n. affectation of a pretty style, manner, etc. |
| PROZYMITES | • prozymites n. Plural of prozymite. • Prozymites n. Plural of Prozymite (Alternative letter-case form of prozymites). • PROZYMITE n. a person who uses leavened bread in the Eucharist (as opposed to an azymite). |
| PTERYGIUMS | • pterygiums n. Plural of pterygium. • PTERYGIUM n. a growth over the cornea. |
| PYRAMIDIST | • pyramidist n. An expert in Egyptian pyramids. • PYRAMIDIST n. someone who studies the Egyptian pyramids. |
| PYRETHRUMS | • pyrethrums n. Plural of pyrethrum. • PYRETHRUM n. a name still applied to various garden flowers, esp. varieties of Chrysanthemum. |
| PYROMETERS | • pyrometers n. Plural of pyrometer. • PYROMETER n. an instrument for measuring very high temperatures. |
| REPAYMENTS | • repayments n. Plural of repayment. • REPAYMENT n. the act of paying back. |
| SPIROMETRY | • spirometry n. (Medicine) The measurement of the volume of air that a person can move into and out of the lungs, using a spirometer. • SPIROMETRY n. the act of measuring the chest capacity by means of a spirometer. |
| SPYMASTERS | • spymasters n. Plural of spymaster. • SPYMASTER n. one who controls spies. |
| SYMPATRIES | • sympatries n. Plural of sympatry. • SYMPATRY n. the state of occupying an area without loss of identity from interbreeding. |