ōs-

Mouth. Oldest form *ə₃ōs-, but precise preform uncertain.

1. oral, os¹, oscillate, osculate, osculum, ostiary, ostium, usher; inosculate, orifice, orinasal, orotund, oscitancy, peroral, from Latin ōs (stem ōr-), mouth, face, orifice, and derivative ōstium (< suffixed form *ōs-to-), door.

2. Auriga, from Latin aurīga, charioteer (< *ōr-īg-, “he who manages the (horse's) bit” -īg-, lengthened from ig-, driving, from *ag-; see ag-), possibly from ōs-.

 

[Pokorny 1. ōus- 784.]

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