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Webster 1913 Edition

Adj.

[Gr.

διάτομοσ

cut through, fr.

διατέμνειν

to cut through;

διά

through +

τέμνειν

to cut. Cf.

(Min.)

Having a single, distinct, diagonal cleavage; – said of crystals.

Mohs.

diatomous ‎(not comparable)

(mineralogy) Having a single, distinct, diagonal cleavage; said of crystals.
(Can we find and add a quotation of Mohs to this entry?)