Ap″si‐dal (ăp″sĭ‐dal), a. 1. (Astron.) Of or pertaining to the apsides of an orbit.
2. (Arch.) Of or pertaining to the apse of a church; as, the apsidal termination of the chancel.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.