say it: THER-too
thereto is an adverb meaning "to that". It is pronounced /ˈðɛɹˌtu/ — THER-too. It carries one recorded sense.
Definitions, synonyms and semantic relations for thereto come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.