Having the form or shape of a cotta (the vestment), or in zoology, shaped like a sculpin (cottid fish).
From cotta or cottid + -form (having the shape of). This is a rare technical term used in specialized ecclesiastical or ichthyological contexts.
Scientific language loves the -form suffix for describing shapes—cottiform in fish descriptions means 'shaped like that grumpy-looking sculpin with the huge head'!
Complete word intelligence in one call. Free tier — 50 lookups/day.