From the derived Indo-European root GEL, which meant to form into
a ball, to stick or cling, or to be thick and sticky, we have inherited
at least 239 modern English words, including the following:

From Old-Middle English - clump, clod, clot, clasp,
clamp, cling, clench, clutch, claw
From Latin - glue, gluten, glutinous, agglutination
From Greek - gluteus, ganglion (a nerve-like bundle),
neuroglia