English thicken

← English thick (suffix)

← English en (suffix)

← Middle English thickenen (inherited)

← Middle English thikkenen (mention)

← Icelandic þykkna (cognate)

← Swedish tjockna (cognate)

→ English thickening (suffix)

→ English thickener (suffix)

→ English rethicken (prefix)

→ English overthicken (prefix)