[f. CONCRETE v. + -ER1, -OR.] One who or that which concretes: spec. a. in Sugar-boiling, an apparatus for concentrating syrup by heat; b. a builder or worker with concrete.
1869. Sugar Cane, I. 124. With a large size Concretor … their production was 15,000 lbs. of sugar per 12 hours.
1874. in Knight, Dict. Mech., Concreter.
