tetrathecal

As a noun terms

is .

As an adjective tetrathecal is

(botany) having four thecae.

In botany|lang=en terms the difference between theca and tetrathecal

is that theca is (botany) the pollen producing organ usually found in pairs and forming an anther while tetrathecal is (botany) having four thecae.

As a noun theca

is (biology) any external case or sheath.

As an adjective tetrathecal is

(botany) having four thecae.

As a numeral four

is (cardinal) a numerical value equal to ; the number after three and before five; two plus two this many dots (••••).

As a noun four

is (countable) the digit or figure 4; an occurrence thereof.

As an adjective tetrathecal is

(botany) having four thecae.