[f. CONJOIN v. + -ER1.] One who or that which conjoins.

1

a. 1638.  Mede, Wks., I. xxxv. 177. That sacred Office whereby all the sons of Levi became Conjoyners … makers of Union … between God and Man.

2

1819.  Cobbett, Eng. Gram., xiv. § 150. The hyphen or conjoiner … as in sea-fish.

3

1830.  Fraser’s Mag., II. 436. This humble conjoiner of leather.

4