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From lac (“milk”) +‎ -ēscō.

lactēscō (present infinitive lactēscere); third conjugation, no passive, no perfect or supine stem

Conjugation of lactēscō (third conjugation, no supine stem, no perfect stem, active only)
indicative		singular			plural
indicative		first	second	third	first	second	third
active	present	lactēscō	lactēscis	lactēscit	lactēscimus	lactēscitis	lactēscunt
	imperfect	lactēscēbam	lactēscēbās	lactēscēbat	lactēscēbāmus	lactēscēbātis	lactēscēbant
	future	lactēscam	lactēscēs	lactēscet	lactēscēmus	lactēscētis	lactēscent
subjunctive		singular			plural
subjunctive		first	second	third	first	second	third
active	present	lactēscam	lactēscās	lactēscat	lactēscāmus	lactēscātis	lactēscant
active	imperfect	lactēscerem	lactēscerēs	lactēsceret	lactēscerēmus	lactēscerētis	lactēscerent
imperative		singular			plural
imperative		first	second	third	first	second	third
active	present	—	lactēsce	—	—	lactēscite	—
active	future	—	lactēscitō	lactēscitō	—	lactēscitōte	lactēscuntō
non-finite forms		active			passive
non-finite forms		present	perfect	future	present	perfect	future
infinitives		lactēscere	—	—	—	—	—
participles		lactēscēns	—	—	—	—	—
verbal nouns		gerund				supine
		genitive	dative	accusative	ablative	accusative	ablative
		lactēscendī	lactēscendō	lactēscendum	lactēscendō	—	—

“lactesco”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
lactesco in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.

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