DWARF. The tr. of דַּק, H1987, “thin,” “fine” (Lev 21:20) where physical handicaps which disqualify a descendant of Aaron from offering sacrifices are listed. The word is used of thin cows and ears of corn (Gen 41:3-7), of small, fine manna (Exod 16:14), of dust (Isa 29:5), and of a mere whisper (1 Kings 19:12). Although the exact meaning is not known, the idea of “withered” fits best (cf. BDB, p. 201—“thin, shrunk, withered”). The LXX and Vul. propose “eye defect,” but this is unlikely.
International Standard Bible Encyclopedia (1915)
The rendering in English Versions of the Bible of the Hebrew word dak, "thin," "small," in Le 21:20, where a list is given of physical failings which forbade man of the seed of Aaron to officiate at the altar, though he might partake of the sacrificial gifts. The precise meaning of the Hebrew word here is uncertain; elsewhere it is used of the lean kine (Ge 41:3) and blasted ears (verse 23) of Pharaoh’s dream; of the grains of manna (Ex 16:14), of the still, small voice (1Ki 19:12), of dust (Isa 29:5), etc. Septuagint and Vulgate (Jerome’s Latin Bible, 390-405 A. D.) suggest defective eyes; but "withered" would perhaps best express the meaning. See Priests and Levites.