before a vowel cub-, combining form of L. cubus CUBE, used in some mathematical terms, as † cubi-cubic a., in cubi-cubic number, the ninth power of a number, or the cube of the cube; in mod. use denoting ‘of the third degree, cubic,’ as cubi-cone, -contravariant, -covariant, cubinvariant, a cone, etc., of the third degree. (Cf. CUBO-.)
1557. Recorde, Whetst., R iij b. .10,077,696. is a Cubicubike number, and his firste Cubike roote is .216.
1662. Hobbes, Seven Prob., Wks. 1845, VII. 67. Though there be some numbers called plane … others quadrato-cubic, others cubi-cubic.
1885. Salmon, Higher Algebra, Index 262 § 254. The cubinvariant of the Hessian.
