副甲状腺素

• 畐(full; abundant)PHONO-SEMANTIC
• 刂(knife (right form))RADICAL

Using a knife to cut and divide the overflowing part into a secondary, subordinate portion alongside.

• 甲(turtle shell; carapace)ASSOCIATIVE

The character depicts a turtle's shell with a crack running through it, symbolizing the hard protective covering.

• ⺾(flesh; body)RADICAL
• 泉(stream; water source)PHONO-SEMANTIC

A gland in the body is like an underground stream that secretes fluid in a steady flow.

• 糸(silk thread; filament)RADICAL
• 龶(coarse undyed thread bundle; top part of thread)ASSOCIATIVE

Raw silk that hasn't been dyed suggests the meaning of pure, simple, and basic.