[ si-nas-tree, sin-uh-stree ]
/ sɪˈnæs tri, ˈsɪn ə stri /

noun Astrology.

the comparison of two or more natal charts in order to analyze or forecast the interaction of the individuals involved.

Origin of synastry

1650–60; < Late Latin synastria favorable conjunction of the stars < Late Greek, equivalent to Greek syn- syn- + ástr(on) star + -ía -y3 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for synastry