Entry 1 sense Webster, 1913 Caviar /kăv'-ē-ärˌ/ · Cav·i·ar · IPA /ˈkæv.iˌɑɹ/ 01 n. The roes of the sturgeon, prepared and salted; -- used as a relish, esp. in Russia. 1. The roes of the sturgeon, prepared and salted; -- used as a relish, esp. in Russia.