Boyd’s Bible Dictionary:
(board). Primitive tables were merely leather or skins spread on the floor. After the captivity they were slightly raised. Beds or couches are meant (Mark 7:4); writing tablet of wax (Luke 1:63). The “tables” (Matt. 21:12; John 2:15), were doubtless sufficiently raised to answer the purposes of a counter for money-changing purposes. The meaning of “serve tables” (Acts 6:2), is that duty which fell to the early Christian ministry of attending to the gathering and distributing of food to the poor, or of collecting and distributing the church funds. This duty was transferred to the deacons (Acts 6:5-6).
Concise Bible Dictionary:
In a few places this term refers to a tablet which could be written on, (Hab. 2:2; Luke 1:63; 2 Cor. 3:3). In Mark 7:4 the word translated “table” is κλίνη, “a couch,” often translated “bed” in the AV.
Strong’s Dictionary of Greek Words:
Meaning:
from 4111; a moulding-board, i.e. flat surface ("plate", or tablet, literally or figuratively)