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The Collaborative International Dictionary
Thorny trefoil

Thorny \Thorn"y\, a. [Compar. Thornier; superl. Thorniest.]

  1. Full of thorns or spines; rough with thorns; spiny; as, a thorny wood; a thorny tree; a thorny crown.

  2. Like a thorn or thorns; hence, figuratively, troublesome; vexatious; harassing; perplexing. ``The thorny point of bare distress.''
    --Shak.

    The steep and thorny way to heaven.
    --Shak.

    Thorny rest-harrow (Bot.), rest-harrow.

    Thorny trefoil, a prickly plant of the genus Fagonia ( Fagonia Cretica, etc.).