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Webster 1913 Edition

Adj.

[Gr. [GREEK] fourth + [GREEK] base.]

(Crystallog.)

Having one fourth the number of planes which are requisite to complete symmetry.

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Te-tarˊto-he′dral-ly

adv.

tetartohedral ‎(not comparable)

(crystallography) Having one fourth of the number of planes required for complete symmetry.