1. Articulata, including spiders, mites, and scorpions.

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

• aracnid,
• arachnid,
• zrachnida,
• srachnida,
• wrachnida,
• qrachnida,
• aeachnida,
• adachnida,
• afachnida,
• atachnida,
• a5achnida,
• a4achnida,
• arzchnida,
• arschnida,
• arwchnida,
• archnida,
• aracnida,
• arcahnida,
• aarachnida,
• Araknida

• arachnidian,
• arraign,
• arceneaux,
• arachnoid,
• arachnid,
• arciniega,
• arsenide.

The adjective form of the word "arachnida" is "arachnid".

The plural form of the word "arachnida" is also "arachnida".

The singular form of the word "arachnida" is "arachnid"