1. The substance of old ropes untwisted and pulled into loose hemp, used for caulking the seams of ships, stopping leaks, &c.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• vacum,
• oxium,
• makem,
• oakly,
• osum,
• takem,
• ogasum,
• sakem,
• aku,
• baum,
• caekum,
• vavum,
• coakup,
• corakam,
• okum,
• oinum,
• makun,
• oakem,
• oaum,
• ockum

The adjective form of the word "oakum" is "oaken".

The plural form of the word "oakum" is "oakums".

The singular form of the word "oakum" is "oakum". The word "oakum" is already a non-count noun, which means it does not have a distinct singular or plural form.