Conduit

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Middle English: from Old French, from medieval Latin conductus, from Latin conducere ‘bring together’ (see conduct).

wiktionary

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From Middle English conduyt, condit, from Old French conduit, from Latin conductus. Doublet of conduct.

etymonline

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conduit (n.)

c. 1300, conduyt, "conduct, guidance, an escorting party" (a sense now obsolete in this word but preserved in its doublet, conduct), from Old French conduit (12c.) "escort, protection; pipe, channel," from Latin conductus "a leading, a pipe," noun use of past participle of conducere "to lead or bring together; contribute, serve," from assimilated form of com "with, together" (see con-) + ducere "to lead" (from PIE root *deuk- "to lead").

Conduct and conduit differentiated in meaning from 15c. Conduit in the sense "medium or means of conveying" is from mid-14c.; as "pipe or tube or other channel for conveyance of water," late 14c.