pro|tac|tin|i|um

pro|tac|tin|i|um
pro|tac|tin|i|um «PROH tak TIHN ee uhm», noun.
a very rare, heavy, radioactive metallic chemical element, which occurs in pitchblende and disintegrates to form actinium. Formerly, protoactinium.
[< prot- + actinium]

Useful english dictionary. 2012.

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  • protactinium — A radioactive element, atomic no. 91, atomic wt. 231.03588, formed in the decay of uranium and thorium; its most long lived isotope, 231Pa, has a half life of 32,500 years. SYN: proactinium, protoactinium. [G. protos, first] …   Medical dictionary

  • o — abi·o·log·i·cal; ab·o·li·tion; ab·o·li·tion·ary; ab·o·li·tion·dom; ab·o·li·tion·ism; ab·o·li·tion·ist; ab·o·li·tion·ize; ab·o·ma·sal; ab·o·ma·sum; ac·an·thol·o·gy; ac·an·thop·o·dous; acar·i·dol·o·gist; ac·a·ri·nol·o·gy; acar·i·o·sis;… …   English syllables

  • ly — ly·so·genesis; ly·so·genetic; Ly·sol; ly·so·lecithin; ly·so·zyme; ly·syl; ly·thra·ce·ae; ly·thra·les; ly·thrum; mach·i·a·vel·li·an·ly; ma·chine·ly; mac·ro·ceph·a·ly; mad·ly; mag·i·cal·ly; mag·is·te·ri·al·ly; mag·is·tral·ly; mag·net·i·cal·ly;… …   English syllables

  • cal — abi·o·log·i·cal; adre·no·cor·ti·cal; aero·bi·o·log·i·cal; aero·chem·i·cal; aero·log·i·cal; aero·med·i·cal; aero·nau·ti·cal; aero·phys·i·cal; aero·tech·ni·cal; aes·thet·i·cal·ly; afo·cal; ag·a·tho·kak·o·log·i·cal; ag·nat·i·cal·ly;… …   English syllables

  • a — acar·a·pis; ac·a·ri·a·sis; ac·a·ri·a·sis; ac·a·ri·na; ac·a·ri·nar·i·um; ac·a·rine; ac·a·ri·nol·o·gy; ac·a·ri·no·sis; ac·a·ro·ce·cid·i·um; ac·a·roid; ac·a·rol·o·gist; ac·a·rol·o·gy; ac·a·ro·pho·bia; ac·a·rus; acat·a·lep·sy; acat·a·lex·is;… …   English syllables

  • ro — neu·ro·anatomic; neu·ro·anatomist; neu·ro·anatomy; neu·ro·bio·tac·tic; neu·ro·bio·taxis; neu·ro·blast; neu·ro·blas·to·ma; neu·ro·canal; neu·ro·central; neu·ro·centrum; neu·ro·chondrite; neu·ro·chord; neu·ro·circulatory; neu·ro·coele;… …   English syllables

  • er — er·i·an·thus; er·ic; er·i·ca; er·i·ca·ce·ae; er·i·cad; er·i·ca·les; er·i·ce·tal; er·i·ce·tic·o·lous; er·i·coid; er·i·co·phyte; erig·er·on; er·i·glos·sa; er·ik·ite; er·i·na·ceous; er·i·na·ceus; er·in·ite; er·i·nose; er·i·o·bot·rya;… …   English syllables

  • Re — Re; re·able; re·absorb; re·absorption; re·accept; re·access; re·accession; re·acclimatization; re·acclimatize; re·accommodate; re·accommodation; re·accounting; re·accredit; re·accreditation; re·acetylation; re·acknowledge; re·acquaint;… …   English syllables

  • dae — acan·thi·sit·ti·dae; ac·an·thu·ri·dae; acar·i·dae; ac·ci·pit·ri·dae; achet·i·dae; acras·pe·dae; acrid·i·dae; acroc·e·rat·i·dae; ac·ro·chor·di·dae; adap·i·dae; ae·ge·ri·i·dae; ae·gi·thin·i·dae; ae·gy·pi·i·dae; ae·o·lid·i·dae; aeto·bat·i·dae;… …   English syllables

  • lar — acap·su·lar; acel·lu·lar; ac·e·tab·u·lar; ac·e·tab·u·lar·ia; acic·u·lar; ac·i·no·tu·bu·lar; ad·mi·nic·u·lar; ad·u·lar·ia; ae·dic·u·lar; afla·gel·lar; aglo·mer·u·lar; agui·lar·ite; ali·vin·cu·lar; al·lar·gan·do; al·ve·o·lar·i·form; am·phi·sty·lar; …   English syllables

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