re·frac·tom·e·ter 
(rē′frăk-tŏmĭ-tər)
(rē′frăk-tŏmĭ-tər)n.
Any of several instruments used to measure the index of refraction of a substance.
- actinobacterium
- actinoid
- actinolite
- actinometer
- actinometric
- actinometrical
- actinometry
- actinomorphic
- actinomorphous
- actinomorphy
- actinomyces
- actinomycete
- actinomycin
- actinomycin D
- actinomycosis
- actinomycotic
- actinon
- actinopterygian
- actinouranium
- action
- actionable
- actionably
- action figure
- actionless
- action painter