'Tear' (the drop) is PIE *dakru- — virtually unchanged for 6,000 years across dozens of languages.
A drop of clear saline liquid secreted by glands in the eyes, especially as a result of emotion or irritation.
From Old English 'tēar' (tear, teardrop), from Proto-Germanic *tahrą (tear), from PIE *dáḱru- (tear, teardrop). This is one of the most stable words in all of Indo-European — the same root appears in virtually every branch with almost identical form and meaning over six millennia. The PIE form reconstructs as *dáḱru-, with the characteristic 'd' preserved in Greek 'dákry' (δάκρυ) and
The PIE word for 'tear' (*dáḱru-) is one of the most perfectly preserved words in human history. From English 'tear' to Greek 'dákry' to Sanskrit 'áśru' to Lithuanian 'ašara,' the word has survived six millennia with its meaning entirely intact — a testament to how universal and unchanging the act of weeping is.