A Phoenician joint (Latin: coagmenta punicana) is a locked mortise and tenon wood joinery technique used in shipbuilding to fasten watercraft hulls.

The ancient Greek historian Polybius reported that the Romans copied the locked mortise and tenon technique from a Punic warship that ran aground in 264 BC.

[5] In the third and early second millennium BC, the Ancient Egyptians employed a similar technique, however, the mortise and tenon joints were not locked in place using pegs.

An example of this technique is the Fourth Dynasty Khufu funerary ship (c. 2600 BC), an intact 43.6 meters (143 ft) long Lebanon cedar lashed-lug vessel, that was unearthed in the Giza pyramid complex.

[14] The hull of the Uluburun ship, an early Phoenician/Canaanite vessel dated c. 1320±50 BC,[17][18][19][20] is the earliest evidence of pegged Phoenician joints used in Mediterranean shipbuilding.

[36] Early in the First Punic War in 260 BC, the Phoenician joint technique allowed the Romans to build a fleet of 100 quinqueremes within a period of two months.

Excavation carried out in waterlogged burials in Dong Xa in Vietnam revealed the adoption of a variety of the locked mortise and tenon technique in the construction of a logboat.

The assembly is locked by driving a peg (or dowel pin or treenail) through one or more holes drilled through the mortise side wall and tenon.

In his treatise on agriculture, De agri cultura,[b] Cato describes the construction of a wooden disk used in oil presses using locked mortise and tenon joinery; he refers to the technique as Punicanis coamentis, thereby crediting Rome's enemies.

These terms derived from the Ancient Greek word Φοῖνιξ ("Phoinix"), plural form Φοίνικες ("Phoinikes"), an exonym used indiscriminately to refer to both western and eastern Phoenicians.