[ 'θi:kə ]
■ noun ( plural ~e -si: )
1》 Anatomy the loose sheath enclosing the spinal cord.
2》 Anatomy the outer layer of cells of a Graafian follicle.
3》 Zoology a cup-like or tubular structure containing a coral polyp.
4》 Botany each of the lobes of an anther, containing two pollen sacs.
Derivatives
~te adjective
Origin
C17: via L. from Gk thēkē 'case'.