13-letter words that end in um
- multiplatinum — Denoting or relating to a musical recording that has sold more than two million copies.
- mycobacterium — A bacterium of a group that includes the causative agents of leprosy and tuberculosis.
- novum organum — a philosophical work in Latin (1620) by Francis Bacon, presenting an inductive method for scientific and philosophical inquiry.
- obiter dictum — an incidental or passing remark, opinion, etc.
- odontoglossum — any epiphytic orchid of the genus Odontoglossum, of the mountainous regions from Bolivia to Mexico.
- organolithium — (organic chemistry) Describing any organic compound containing a carbon to lithium bond.
- paramenstruum — the four days before and first four days of menstruation
- perichondrium — the membrane of fibrous connective tissue covering the surface of cartilages except at the joints.
- platiniridium — a natural alloy composed chiefly of platinum and iridium.
- pons asinorum — a geometric proposition that if a triangle has two of its sides equal, the angles opposite these sides are also equal: so named from the difficulty experienced by beginners in mastering it. Euclid, 1:5.
- protoactinium — protactinium.
- pycnoconidium — a pycnidiospore
- radioactinium — the radioactive isotope of thorium having a mass number 227 and a half-life of 18.8 days. Symbol: RdAc, Th 227.
- river red gum — a large Australian red gum tree, Eucalyptus camaldulensis, growing along river banks
- rose geranium — a geranium, Pelargonium graveolens, cultivated for its fragrant, lobed or narrowly divided leaves.
- rutherfordium — a superheavy, synthetic, radioactive element with a very short half-life. Symbol: Rf; atomic number: 104.
- semi-delirium — Pathology. a more or less temporary disorder of the mental faculties, as in fevers, disturbances of consciousness, or intoxication, characterized by restlessness, excitement, delusions, hallucinations, etc.
- share premium — the excess of the amount actually subscribed for an issue of corporate capital over its par value
- south dum dum — a city in SE West Bengal state, in E India.
- spathiphyllum — any of various tropical plants of the genus Spathiphyllum, having a white or green spathe and a spike of fragrant flowers and often cultivated as an ornamental.
- spermatangium — the organ that produces spermatia in red algae.
- sterculia gum — karaya gum.
- subcinctorium — an embroidered silk vestment resembling, but somewhat broader than, a maniple, worn by the pope on solemn occasions.
- succinctorium — subcinctorium.
- sustentaculum — an organ or part that gives support
- sweet alyssum — a garden plant, Lobularia maritima, of the mustard family, having narrow leaves and small, white or violet flowers.
- sweet sorghum — sorgo.
- tintinnabulum — a small, tinkling bell or a set of bells played in succession.
- vivisectorium — the location where vivisection takes place
- w3 consortium — World Wide Web Consortium
- water opossum — yapok.
- wild geranium — geranium (def 2).
- zoosporangium — a sporangium or spore case in which zoospores are produced.