rectrix

Learned borrowing from Latin rēctrīx (“one who directs”). By surface analysis, rector +‎ -trix.

rectrix (plural rectrices)

1. A governess; a rectoress.
2. A flight feather on the tails of birds, used for directional control.

• rectricial

From regō, rēctum (“to rule”, verb) +‎ -trīx f (“-ess”, agentive suffix).

• (Classical Latin) IPA^(key): [ˈreːk.triːks]
• (modern Italianate Ecclesiastical) IPA^(key): [ˈrɛk.t̪riks]

rēctrīx f (genitive rēctrīcis, masculine rēctor); third declension

1. governess, directress
2. (New Latin) , steering-feather

Third-declension noun.

• → English: rectrix
• → French: rectrice (learned)

• rectrix in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.
• rectrix in Georges, Karl Ernst, Georges, Heinrich (1913–1918) Ausführliches lateinisch-deutsches Handwörterbuch, 8th edition, volume 2, Hahnsche Buchhandlung
• “rectrix”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press