This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A case, covering, or sheath, such as the pollen sac of an anther, the spore case of a moss, or the outer covering of the pupa of certain insects.

n. Any external case or sheath.

n. The pollen producing organ usually found in pairs and forming an anther.

n. The twin layers of cells surrounding the basal lamina of an ovarian follicle

n. The membrane complex enveloping the cells of certain plankton including diatoms and dinoflagellates

n. The calcareous wall of a corallite, the exoskeleton of a coral polyp

n. A sheath; a case

n.

n. The chitinous cup which protects the hydranths of certain hydroids.

n. The more or less cuplike calicle of a coral.

n. The wall forming a calicle of a coral.

n. In the graptolites, one of the receptacles of the zoöids.

n. A case; box; sheath.

n. [capitalized] A genus of pteropods, having a sheath-like shell, typical of the family Thecidæ. Sowerby, 1845. Also named Hyolithes (Eichwald, 1840).

n. outer sheath of the pupa of certain insects

n. a case or sheath especially a pollen sac or moss capsule

"Fully formed ovarian follicle: • Outside the theca interna some fibrous tissue becomes condensed to form another covering for the follicle called the theca externa."

sheath    case    cover    covering    natural covering   

brachial thecæ    theca vertebralis    stolonal thecæ    theca folliculi   

thecium   

thecae   

thecate    theca externa    ootheca    thecal    theca folliculi    spermatheca    hypotheca    thecoma    epitheca    theca interna   

sheath    case   

interleukin    paydown