Crown thistle

( Bot. ) See FRITILLARIA. Crown-wheel', n. ( Mech.) Circular motion is communicated at right angles by means of teeth, or cogs, situated parallel to the axis of the wheel. Wheels thus formed are denominated crown, or contrate wheels; they act either upon a common pinion, or a lantern. Isthmus, and abt. 20 m. N.N.W. of the city of, Panama. Crucial, ( krooshal ,) a. [Fr.; from Lat. crux, crucis, a cro .] In the form of a cro ; transverse; pa ing acro . as, a crucial test.