prosum

Latin

From prō- +‎ sum (“I am”). See also probus.

prōsum (present infinitive prōdesse, perfect active prōfuī, future participle prōfutūrus); irregular conjugation

(with a dative) I am useful or of use, do good, help, benefit, serve, profit.
- c. 35 CE – 100 CE, Quintilian :
  Nocere facile est, prodesse difficile.
  It is easy to do harm, difficult to do good.
(of medicines) I am good or beneficial.
- c. 37 BCE – 30 BCE, Virgil, Georgicon 4.267:
  proderit et tunsum gallae admiscere saporem […]
  It is good too to blend a taste of pounded oak-apples […]

Conjugation of prosum (highly irregular, suppletive, active only)
indicative		singular			plural
indicative		first	second	third	first	second	third
active	present	prōsum	prōdes	prōdest	prōsumus	prōdestis	prōsunt
	imperfect	prōderam	prōderās	prōderat	prōderāmus	prōderātis	prōderant
	future	prōderō	prōderis, prōdere	prōderit	prōderimus	prōderitis	prōderunt
	perfect	prōfuī	prōfuistī	prōfuit	prōfuimus	prōfuistis	prōfuērunt, prōfuēre
	pluperfect	prōfueram	prōfuerās	prōfuerat	prōfuerāmus	prōfuerātis	prōfuerant
	future perfect	prōfuerō	prōfueris	prōfuerit	prōfuerimus	prōfueritis	prōfuerint
subjunctive		singular			plural
subjunctive		first	second	third	first	second	third
active	present	prōsim	prōsīs	prōsit	prōsīmus	prōsītis	prōsint
	imperfect	prōdessem, prōforem	prōdessēs, prōforēs	prōdesset, prōforet	prōdessēmus, prōforēmus	prōdessētis, prōforētis	prōdessent, prōforent
	perfect	prōfuerim	prōfuerīs	prōfuerit	prōfuerimus	prōfueritis	prōfuerint
	pluperfect	prōfuissem	prōfuissēs	prōfuisset	prōfuissēmus	prōfuissētis	prōfuissent
imperative		singular			plural
imperative		first	second	third	first	second	third
active	present	—	prōdes	—	—	prōdeste	—
active	future	—	prōdestō	prōdestō	—	prōdestōte	prōsuntō
non-finite forms		active			passive
non-finite forms		present	perfect	future	present	perfect	future
infinitives		prōdesse	prōfuisse	prōfutūrus esse, prōfore	—	—	—
participles		—	—	prōfutūrus	—	—	—

prosum in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
prosum in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
prosum in Gaffiot, Félix (1934) Dictionnaire Illustré Latin-Français, Hachette
prosum in Ramminger, Johann (accessed 16 July 2016) Neulateinische Wortliste: Ein Wörterbuch des Lateinischen von Petrarca bis 1700‎, pre-publication website, 2005-2016

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