A kind of specialized cell located in the lower leaf epidermis of plants. Pairs of guard cells surround tiny stomatal airway pores and regulate their opening and closing.

In a watchful state; alert; vigilant.

tide lock

To pass the watch or sentinel without leave.

A warship stationed at a port etc. to act as a guard.

plural of guard cell

plural of guard band

plural of after-guard

Alternative spelling of afterguard.

plural of honour guard