These distinguishments depend on difference in specific gravity, hardness, solubility in hot acids, and the action of high heat.
The general is badly frightened, and calls upon me to proclaim his distinguishments and rank.
1560s, from Middle French distinguiss-, stem of distinguer, or directly from Latin distinguere "to separate between, separate by pricking," from dis- "apart" (see dis-) + -stinguere "to prick" (see extinguish, and cf. Latin instinguere "to incite, impel").
The suffix -ish is due to the influence of many verbs in which it is the equivalent of Old French -iss-, ultimately from Latin inchoative suffix -iscere (this is also the case in extinguish, admonish, and astonish). Related: Distinguishing. The earlier form of the verb was distinguen (mid-14c.).