رِدْءٌ

A buttress, or the like, by means of which a wall is strengthened and supported. (T.) [This is the primary signification. See also رِدٌّ, in article رد.]

[Or] the primary meaning is A thing by means of which one is helped, aided, or assisted; such as the دِفْء [or thing by which one is rendered warm, or protected from the cold wind]. (Bd in xxviii. 34; where it has the meaning next following, as is said in the T and S.)

A helper, an aider, or an assistant. (T, S, M, Mgh, Msb, K.) You say, فُلَانٌ رِدْءٌ لِفُلَانٍ Such a one is an aider and a strengthener to such a one. (T.)

And i. q. مَادَّةٌ [apparently as meaning An accession; or a thing that is added, whatever it be, to another thing]. (M, K.)

And (tropical:) i. q. عِدْلٌ [i. e. A burden that balances another burden on the other side of a beast]; (T, TA;) so called because one such ردء supports another: (TA:) and a heavy عِدْل: (T, K, TA:) plural أَرْدَاءٌ. (T, TA.)