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Webster 1913 Edition

(ärzˊmĕt′rĭk)

Noun.

[An erroneous form of

arithmetic

, as if from L.

ars metrica

the measuring art.]

Arithmetic.

[Obs.]

Chaucer.

arsmetrike ‎(uncountable)

Obsolete form of arithmetic. [14th-16th c.]
- Geoffrey Chaucer, The Summoner's Tale, ll. 558-589 www.librarius.com/canttran/summtrfs.htm
  In ars-metrike shal there no man fynde, / Biforn this day, of swich a question.