研ぎ is read as とぎ (togi) and means polish.
とぎ
togi
けんきゅう
study
とぐ
to wash (rice)
けんきゅういん
researcher
けんきゅうか
けんきゅうしゃ
けんきゅうしつ
laboratory
けんきゅうじょ
research establishment
けんしゅう
training (esp. in-service)
けんま
grinding
けんきゅうかん
research officer
けんしゅういん
trainee
けんきゅうけっか
results of a scientific investigation