† monotomousadj. [ < mono-comb. form + ancient Greek τομή (see -tomecomb. form) + -oussuffix] MineralogyObsoleterare (of a mineral) having a cleavage distinct only in a single direction.
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1835 C. U. ShepardTreat. Mineral. I. p. xxxi Pearl Kerate..1 Hexahedral..2 Pyramidal..3 Monotomous.