frātercŭlus

i, m.

frater

I. a little brother.
I. Lit.: unde fit, ut malim fraterculus esse Gigantis, i. e. of unknown parents. qs. sprung from the earth, Juv. 4, 98. —
II. Transf. (acc. to frater, II. A.), a familiar appellation given to a friend: quam copiose laudatur Apronius a Timarchide ... Volo, mi frater, fraterculo tuo credas, Cic. Verr. 2, 3, 66, § 155.
Lewis & Short
A Latin Dictionary, 1879
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