[ si-nas-tree, sin-uh-stree ]
/ sɪˈnæs tri, ˈsɪn ə stri /
the comparison of two or more natal charts in order to analyze or forecast the interaction of the individuals involved.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for synastry
Synastry, si-nas′tri, n. coincidence as regards stellar influences.