1. Spiny.

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

• zcanthoid,
• scanthoid,
• wcanthoid,
• qcanthoid,
• axanthoid,
• avanthoid,
• afanthoid,
• adanthoid,
• acznthoid,
• acsnthoid,
• acwnthoid,
• acqnthoid,
• acabthoid,
• acamthoid,
• acajthoid,
• acahthoid,
• acanrhoid,
• acanfhoid,
• acanghoid,
• acanthoide

• acanthocyte,
• acanthion,
• acanthosis,
• acanthus,
• acanthous,
• accentor,
• acanthotic,
• acantholysis,
• acanthurus,
• acanthuridae,
• aconite,
• acanthaceae,
• accent,
• acanthophis,
• acanthoma,
• accented.

The adjective form of the word "acanthoid" is "acanthoid".

The plural form of the word "acanthoid" is "acanthoids".

The singular form of the word "acanthoid" is "acanthus"