• home

Memorandum
This word comes from the gerundive form of the Latin verb memoro, which means "it must be remembered."  It entered English usage in the 14th century.  It now primarily refers to messages sent within an organization.
OED [EB] 

Metropolis
Greek, mētēr, "mother" + polis, "city" and thus the parent city of a colony or a capital city. In English, it means a capital or important city. 
OED  [JM]

Modicum
This word still holds its basic meaning from the Latin, which was "a small amount" though the Romans used the word with the implication of money, while in English it is more often used in connection with food.  [JC]

Narrator
In Latin, this word means "one who gives an account of something," and it was borrowed into English with the same meaning in 1611.
OED  [EB]

Nata
This is a Latin word which means literally "having been born" and in English signals one's maiden name (e.g., "nata Stanhope").   [MD]

Nostrum
A Latin word which literally means "of ours" or "our;" one of its English meanings has come to refer to someone's own method of achieving a goal or cure.  This definition of the word is cited by the OED as occurring as early as 1741.  [MD]

Nova Scotia
Nova is a Latin word meaning "new."  [EB]

Odium
Trollope uses this Latin noun meaning "hatred" or "grudge."  The word was incorporated into English in 1607 and means the same as the Latin definition.
OED  [KD]

Omnibus
A Latin word meaning "for all," in English refers to a vehicle used for public transportation, which could be simply referred to (in clipped form) as a 'bus' in modern English. This term was first used several decades before Trollope, in 1829. 
OED [MD]

Onus
This Latinate word still retains its original meaning of a burden or obligation.  It is known to be in English usage by 1626.  [JC & TH]

Opera
Opera in Latin means an activity devoted to a task or effort.  The word today usually suggests a dramatic musical performance; however, opera can be used to describe a work of music or simply a task in itself.
OED  [KD]

Opodeldoc
Post-classical Latin oppodeltoch, a medical poultice of some sort, usually involving oils or soaps. 
OED  [JM]

Opprobrium
Latin, meaning "disgrace, scandal, or reproach."  [JM]