pyknonThe lower part of a tetrachord in Ancient Greek music, consisting of a composite interval (two successive intervals) that is less than the remaining (incomposite) interval.
pyknosisShrinkage and condensing, such as that of a dying cell or the appearance of a cell's nucleus.
pykreteA solid substance made of water ice and sawdust, stronger than pure ice. Originally to be used in combination with a refrigeration system as hull material for warships. Used as a building material for ice buildings (such as winter ice hotels) and ice sculptures, usually without the originally envisioned embedded refrigeration systems.
pylaThe passage between the iter and optocoele in the brain.
PyladesA Phocian prince known for his relationship with his cousin Orestes, son of Agamemnon.
pylagoreA deputy of a state at the amphictyonic council.
pyogenA microorganism responsible for a wide range of human illnesses, spanning from mild throat and skin infections to life-threatening invasive diseases.
pyometraAn infection of the uterus most commonly seen in dogs, but also occasionally in other small mammals, resulting from hormonal and structural changes in the lining of the uterus.
pyomyositisA bacterial infection of the skeletal muscles which results in a pus-filled abscess.
pyralspiteA form of garnet consisting of a solid solution series of pyrope, almandine, and spessartine.
pyramAny of many ectoparasitic sea snails of the family Pyramidellidae
pyramidAn ancient massive construction with a square or rectangular base and four triangular sides meeting in an apex, such as those built as tombs in Egypt or as bases for temples in Mesoamerica.
pyramidingThe practice of an athlete progressively increasing the dosage of an illicit drug to a maximum, and then progressively lowering it, between competitions so as to reduce the chances of being caught.
pyramidionThe small pyramid which crowns or completes an obelisk or pyramid.
pyramidiotpyramidologist; one who believes prophecies are encoded in Egyptian pyramids.
pyramidismclassification into a rigid hierarchy, as of the sciences
pyramidologistOne who studies pyramidology, who studies pyramids from a supernatural viewpoint.
pyramidologyThe study of pyramids (especially the Egyptian pyramids) from a supernatural or new-age perspective, rather than the historical or archaeological viewpoint.
pyramidonAn organ stop having wooden pipes in the form of an inverted pyramid, giving very deep notes somewhat like those of a stopped diapason.