by-channel
(ˈbaɪˌtʃænəl)
[f. by- 3 b + channel.]
A side-stream apart from the main channel; fig. a collateral branch (of a family).
| 1628 Earle Microcosm. (Arb.) 71 Not a by-Channell or bastard escapes him. 1864 Bates Nat. Amazon Pref. 6 The network of by-channels and lakes which everywhere accompanies its [the Amazon's] course. |