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Proto-Italic *put-sle-los → *pussillos followed by degemination via the so-called "mamilla rule", from Proto-Indo-European *put-lo- (“son”), historically standing in relation to pullus (“young of an animal”) as a diminutive. Latin cognates include pusillus, putillus (“tiny”), pūsus (“boy”), possibly Vulgar Latin *pūtta (“whore”). Further cognate to Faliscan putellio (“little son”, nom.sg.), Oscan puklum (acc.sg.), Paelignian puclois (dat.pl.), Sanskrit पुत्र (putrá, “son, child”), Avestan 𐬞𐬎𐬚𐬭𐬀 (puθra, “child, son”), Lithuanian putýtis (“little bird”), Latvian putns (“bird”), Old Church Slavonic пътица (pŭtica, “bird”). For the correspondence pullus :: pusillus compare paullus :: pauxillus, vēlum :: vēxillum.

Compare pisinnus, pitinnus; see also putus, a ghost word. A connection of the stem *put- with puer is difficult to establish.

pusillus (feminine pusilla, neuter pusillum); first/second-declension adjective

First/second-declension adjective.

	masculine	feminine	neuter	masculine	feminine	neuter
	singular			plural
nominative	pusillus	pusilla	pusillum	pusillī	pusillae	pusilla
genitive	pusillī	pusillae	pusillī	pusillōrum	pusillārum	pusillōrum
dative	pusillō	pusillae	pusillō	pusillīs
accusative	pusillum	pusillam	pusillum	pusillōs	pusillās	pusilla
ablative	pusillō	pusillā	pusillō	pusillīs
vocative	pusille	pusilla	pusillum	pusillī	pusillae	pusilla

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