different between ictic vs octic

English

Latin ictus (“a blow”).

ictic (not comparable)

Pertaining to, or caused by, a blow; sudden; abrupt.
- 1858, Horace Bushnell, Sermons for the New Life
  It is not, on one hand, the power of omnipotence, or of a naked, ictic force, falling in secretly regenerative blows, like a slung shot in the night.
(poetry) of a syllable in verse, carrying the beat.

ictic in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.

From Latin octo (“eight”) +? -ic.

octic (not comparable)

(mathematics) Of the eighth degree or order.
- 1999, William Dunham, Euler: The Master of Us All, Mathematical Association of America 1999, p. 116:
  Unfortunately, an analogous attack on the octic polynomial becomes exceedingly complicated.

octic (plural octics)

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