Allen and Greenough's New Latin Grammar, section 112

Heavy Construction

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112.

Stems in ro- preceded by a consonant form the Nominative Masculine like ager (§ 47) and are declined as follows: -

niger, nigra, nigrum, black

	MASCULINE	FEMININE	NEUTER
	STEM nigro-	STEM nigrá-	STEM nigro-
		SINGULAR	NOM.
GEN.	nigrí	nigrae	nigrí
DAT.	nigró	nigrae	nigró
ACC.	nigrum	nigram	nigrum
ABL.	nigró	nigrá	nigró
		PLURAL	NOM.
GEN.	nigrórum	nigrárum	nigrórum
DAT.	nigrís	nigrís	nigrís
ACC.	nigrós	nigrás	nigra
ABL.	nigrís	nigrís	nigrís

a. Like niger are declined aeger, áter, créber, faber, glaber, integer, lúdic, macer, piger, pulcher, ruber, sacer, scaber, sinister, taeter, vafer; also the possessives noster, vester (§ 145).