Word Direct Answers

apsis

apsis is defined in Webster's Unabridged Dictionary (1913) with 2 senses. The full text of each entry is reproduced verbatim below.

Definitions

  1. 1.(Math.) In a curve referred to polar coördinates, any point for which the radius vector is a maximum or minimum.
  2. 2.(Arch.) Same as Apse.

Source: Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).

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