The Collaborative International Dictionary
Potent \Po"tent\, a. [L. potens, -entis, p. pr. of posse to be able, to have power, fr. potis able, capable (akin to Skr. pati master, lord) + esse to be. See Host a landlord, Am, and cf. Despot, Podesta, Possible, Power, Puissant.]
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Producing great physical effects; forcible; powerful' efficacious; as, a potent medicine. ``Harsh and potent injuries.''
--Shak.Moses once more his potent rod extends.
--Milton. -
Having great authority, control, or dominion; puissant; mighty; influential; as, a potent prince. ``A potent dukedom.''
--Shak.Most potent, grave, and reverend signiors.
--Shak. -
Powerful, in an intellectual or moral sense; having great influence; as, potent interest; a potent argument.
Cross potent. (Her.) See Illust. (7) of Cross.
Syn: Powerful; mighty; puissant; strong; able; efficient; forcible; efficacious; cogent; influential.
Wikipedia
A cross potent (plural: crosses potent), also known as a crutch cross, is a form of heraldic cross with crossbars or " crutches" at the four ends. In German, it is known as a Krückenkreuz (literally "crutches cross"). Potent is an old word for a crutch, from a late Middle English alteration of Old French potence 'crutch', from Latin potentia 'power' (which in medieval Latin meant 'crutch'). The term potent is also used in heraldic terminology to describe a 'T' shaped alteration of vair, and potenté is a line of partition contorted into a series of 'T' shapes.