What is the meaning of وتر?

to string (as a bow), to provide with a string

to wrong, to harm, to cheat, to dupe

to stretch, to strain, to draw tight, to pull taut

uneven

odd (numbers)

string

sinew, tendon

chord

hypotenuse

verbal noun of وَتَرَ (watara) 

moist land (ie. soil that is fertile/suitable for farming)

knack; method

hypotenuse

odd, alone

Witr, a salah done after Isha and before Fajr

threshing the field before ploughing

Source: wiktionary.org