Home

Visit Our Sites

Unabridged Dictionary

Learner's Dictionary

Word Central for Kids

Collegiate Dictionary

Premium Services

Unabridged Dictionary

Collegiate Dictionary

Encyclopedia Britannica

Institutional Subscriptions

Citing the Dictionary

Also Visit:
Unabridged
Visual

ESL:
Learner's
for Kids:
Word Central
Spell It!

Browse the Medical Dictionary:: A; B; C; D; E; F; G; H; I; J; K; L; M; N; O; P; Q; R; S; T; U; V; W; X; Y; Z; #

diopter

Main Entry:: di·op·ter
Variant(s):: or chiefly British di·op·tre \dī-ˈäp-tər, ˈdī-ˌäp-\
Function:: noun

: a unit of measurement of the refractive power of a lens equal to the reciprocal of the focal length in meters

Learn more about "diopter" and related topics at Britannica.com

Pronunciation Symbols