The building blocks of English

Affixes

-metric

Also ‑metrical, ‑metry, ‑metrics, ‑metrist, and ‑metrician.

Measurement.

Greek metron, measure; ‑metrēs, measurer.

Nouns in ‑metry denote procedures and systems that correspond to the names of instruments ending in ‑meter: calorimetry, dosimetry, interferometry, thermometry. Other words in this ending connected with measurement are geometry, symmetry (Greek sun‑, with), and trigonometry (Greek trigōnos, three-cornered).

Nouns ending in ‑metrics (usually considered to be singular) are of topics of study concerned with measurement, as with econometrics, concerned with mathematical methods used to describe economic systems; and psychometrics, the science of measuring mental capacities and processes. Practitioners of these disciplines (and some whose names end in ‑metry) have names ending in ‑metrist (psychometrist) or ‑metrician (econometrician).

Nouns in ‑meter, ‑metry, and ‑metrics have corresponding adjectives in ‑metric (barometric, geometric, psychometric) or less commonly in ‑metrical (diametrical, symmetrical), sometimes both.