
a member of this organization.
an Irish republican political movement founded about 1905 and linked to the revolutionary Irish Republican Army: divided into a Provisional and an Official movement since a similar split in the IRA in late 1969
Sinn Fein [(shin fayn)]

An Irish political party (in Gaelic it means “Ourselves Alone”) that has long combatted Great Britain’s influence in Ireland and sought the unification of Northern Ireland with the Irish republic in the south; generally considered the political portion of the Irish Republican Army. One wing of it has engaged in terrorism.


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  • Sinningia

    noun 1. any of various tropical American plants belonging to the genus Sinningia, of the gesneria family, including the gloxinia and other species cultivated as houseplants for their variously colored flowers.

  • Sino

    1. a combining form representing sinus, in compound words: sinorespiratory. 1. a combining form meaning “Chinese”: Sino-Tibetan; Sinology. combining form 1. Chinese: Sino-Tibetan, Sinology

  • Sinoatrial

    sinoatrial si·no·a·tri·al (sī’nō-ā’trē-əl) or si·nu·a·tri·al (sī’nōō-ā’trē-əl, -nyōō-, sĭn’yōō-) adj. Abbr. S-A Relating to the venous sinus and the right atrium of the heart.

  • Sinoatrial block

    sinoatrial block n. Failure of an impulse to leave the sinoatrial node. Also called sinoauricular block, sinus block.
