The source is positronium, a short-lived stuff made of the simplest atom yet discovered (Science News Letter).
Useful english dictionary. 2012.
pos — ad·i·pos·i·ty; an·tero·pos·te·ri·or; an·thro·pos·co·py; an·thro·pos·o·phy; bal·a·no·pos·thi·tis; col·pos; com·pos·ed·ly; com·pos·er; com·pos·i·tae; com·pos·ite·ness; com·pos·i·tive; com·pos·i·tor; com·pos·i·tum; com·pos; com·pos·si·bil·i·ty;… … English syllables
a|pos|tro|phe — a|pos|tro|phe1 «uh POS truh fee», noun. a sign of punctuation used: 1. to show the omission of one or more letters in the spelling of contractions, as in can t for cannot and o er for over. 2. to show the possessive forms of nouns or indefinite… … Useful english dictionary
a|pos|tro|phize — a|pos|tro|phize1 «uh POS truh fyz», transitive verb, intransitive verb, phized, phiz|ing. 1. to mark with an apostrophe or apostrophes. 2. to write or print using an apostrophe or apostrophes. ╂[< apostrophe1 + ize] a|pos|tro|phize 2 «uh POS… … Useful english dictionary
e|lec|tro|de|pos|it — «ih LEHK troh dih POZ iht», verb, noun. –v.t. to deposit (a substance) by electrolysis. –n. a deposit produced by electrolysis … Useful english dictionary
e|lec|tro|pos|i|tive — «ih LEHK troh POZ uh tihv», adjective, noun. –adj. 1. charged with positive electricity. 2. tending to pass to the negative pole (cathode) in electrolysis. 3. tending to lose electrons; metallic; basic. –n. an electropositive substance … Useful english dictionary
e|lec|tro|pos|i|tiv|i|ty — «ih LEHK troh POZ uh TIHV uh tee», noun. the condition of being electropositive … Useful english dictionary
positronium — pos·i·tro·ni·um … English syllables
Tropos — Trọ|pos 〈m.; , Trọ|poi〉 = Trope … Universal-Lexikon
positrocephalogram — pos·i·tro·ceph·a·lo·gram (poz″ĭ tro sefґə lo gram) [positron + cephalo + gram] a record produced by the emission of positrons by isotopes of arsenic administered to facilitate localization of brain tumors … Medical dictionary
positronium — pos•i•tro•ni•um [[t]ˌpɒz ɪˈtroʊ ni əm[/t]] n. phs a short lived atomic system consisting of a positron and an electron bound together • Etymology: 1945; positron+ ium II … From formal English to slang
