Up'per-mōst, a.
a. [Superl. of up, or upper.] Further up; upmost; highest in situation, position, rank, power, or the like; supreme. “Whatever faction happens to be uppermost.” Swift.
a. [Superl. of up, or upper.] Further up; upmost; highest in situation, position, rank, power, or the like; supreme. “Whatever faction happens to be uppermost.” Swift.