11-letter words that end in um
- perineurium — the sheath of connective tissue that encloses a bundle of nerve fibers.
- peristylium — a peristyle.
- perithecium — the fruiting body of ascomycetous fungi, typically a minute, more or less completely closed, globose or flask-shaped body enclosing the asci.
- perithelium — the connective tissue surrounding certain small vessels, as capillaries.
- phosphonium — the positively charged group PH 4 + .
- photo album — bound book for photos
- pittosporum — any of various shrubs or trees of the genus Pittosporum, native to warm regions of the Old World, many species of which are cultivated as ornamentals for their attractive foliage, flowers, or fruit.
- planetarium — an apparatus or model representing the planetary system.
- play possum — opossum.
- podophyllum — the dried rhizome of the May apple, Podophyllum peltatum, from which podophyllin is derived.
- polychasium — a form of cymose inflorescence in which each axis produces more than two lateral axes.
- polygonatum — a plant of the genus Polygonatum
- polyzoarium — a bryozoan colony, or its supporting skeleton.
- ponzimonium — theoretical financial turmoil in the wake of uncovering suspected Ponzi schemes
- positronium — a short-lived atomic system consisting of a positron and an electron bound together.
- post-bellum — of or during the period after a war, esp the American Civil War
- postscenium — a wing on either side of the stage of an ancient Greek or Roman theatre where props could be stored and actors could prepare; a parascenium
- potash alum — alum1 (def 1).
- procerebrum — (in certain invertebrates) the front part of the central nervous system
- proctodaeum — proctodeum.
- promycelium — a short filament produced in the germination of a spore that bears small spores and then dies.
- prothallium — Botany. the gametophyte of ferns and related plants.
- pteropodium — the foot of a pteropod.
- quadrennium — a period of four years.
- radiocesium — cesium 137.
- radiosodium — the radioactive isotope of sodium having an atomic mass of 24 and a half-life of 14.9 hours: used as a tracer in biochemistry.
- retinaculum — Anatomy, Zoology. any of various small structures that hook, clasp, or bind other structures to move them or hold them in place.
- rijksmuseum — a museum in Amsterdam housing the national art collection of the Netherlands
- roentgenium — a superheavy, synthetic radioactive element with a very short half-life. Symbol: Rg; atomic number: 111.
- satellitium — a group of three or more planets lying in one sign of the zodiac
- scriptorium — a room, as in a monastery, library, or other institution, where manuscripts are stored, read, or copied.
- sempervivum — any of various succulent plants belonging to the genus Sempervivum, of the stonecrop family, having leaves in dense basal rosettes and a compact, flat-topped cluster of flowers, and including the houseleek, S. tectorum, and other commonly cultivated species.
- sempiternum — a type of durable woollen fabric popular in the 17th century
- sense datum — Also called sensum. Psychology. the basic unit of an experience resulting from the stimulation of a sense organ; a stimulus or an object of perception or sensation.
- sericterium — a silk-producing gland in a silkworm
- sphaeridium — a round body found on sea urchins
- sporogonium — the sporangium of mosses and liverworts.
- spotted gum — an Australian eucalyptus tree, Eucalyptus maculata
- staminodium — a sterile or abortive stamen.
- stamp album — a book used by collectors of postage stamps to display and store their stamps
- stylopodium — a glandular disk or expansion surmounting the ovary and supporting the styles in plants of the parsley family.
- subdelirium — a mild delirium with lucid intervals.
- succedaneum — a substitute.
- supercilium — the fillet above the cyma of a cornice.
- superphylum — a category of related phyla within a kingdom.
- suppedaneum — a shelf affixed to a cross for supporting the feet of the crucified.
- syllabarium — syllabary.
- taurobolium — the sacrifice of a bull, followed by the baptism of neophytes in the blood, as practiced in the ancient rites of Mithras or Cybele.
- telescopium — an inconspicuous constellation in the S hemisphere, close to Sagittarius and Ara
- termitarium — a termites' nest.