glir-

verb. to sing, recite poem

glir-

verb. to sing, trill, to recite a poem

The form glin in the Etymologies is a misreading according to VT/45:15

glin-

verb. to sing

glîr

noun. song, poem, lay

liria-

verb. to sing

glaer

noun. long lay, narrative poem

Written glær (with ae-ligature) in the Etymologies, rectified here according to VT/45:15

lhaer

noun. song, long lay

lhîr

noun. song, poem, lay