Boyd’s Bible Dictionary:
(lynx urine). Possibly amber. First stone in third row of high priest’s breastplate (Ex. 28:19; 39:12).
Concise Bible Dictionary:
The first in the third row of gems in the breastplate. It is supposed by some to be the hyacinth, by others the lyncurium, and by others amber; but its identification is uncertain (Ex. 28:19; Ex. 39:12).
Strong’s Dictionary of Hebrew Words:
Meaning:
from an unused root of uncertain meaning; a gem, perhaps the jacinth
Jackson’s Dictionary of Scripture Proper Names:
same as Leshem