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Latin · Accusativus and Ablativus. Prepositions. Prescription. Prescription Line

Names of drugs and plants

Nomina medicamentorum et plantarum

In medical Latin, the names of most medicinal products belong to the neuter gender of the second declension and end in -um. The names of medicinal plants show more diverse gender affiliation and include important exceptions that must be memorized for correct prescription writing.

Drug endingsThe absolute majority of drugs end in -um and belong to the neuter gender.
Gender exceptionCrataegus (hawthorn) is feminine despite ending in -us.
Indeclinable wordThe name Cacao (cocoa) has no grammatical endings and does not change by case.
Frequency stemThe root -phyll- denotes relation to a leaf (from the Greek phyllon).
4 min readFor medical studentsUpdated 09/24/2026
Material prepared by WhiteCoat Pro editorial team based on platform study guidesReviewed by medical editor: Aulov A. A., general practitioner · 09/24/2026

Features of drug names

In pharmaceutical terminology, chemical and pharmaceutical products traditionally receive Latin names belonging to the second declension neuter gender. In their dictionary form (nominative singular), such terms end in -um, and in the genitive singular in -i.

This broad group includes such well-known agents as:

  • Adrenalinum (adrenaline)
  • Dibazolum (dibazole)
  • Ichthyolum (ichthammol)
  • Norsulfazolum (norsulfazole)
  • Novocainum (procaine)
  • Papaverinum (papaverine)
  • Sulfadimezinum (sulfadimezine)
  • Synthomycinum (synthomycin)
  • Xeroformium (xeroform)

A similar grammatical model is followed by Cordigitum (cordigit), Dimedrolum (diphenhydramine), Furacilinum (nitrofurazone), Mentholum (menthol), Nitroglycerinum (nitroglycerin), and Phenacetinum (phenacetin).

However, there are exceptions to this rule that students frequently confuse on exams. For example, Aether, ĕris m (ether) is declined according to the third declension and is masculine. Meanwhile, the name Cacao (cocoa) is indeclinable altogether.

Nomenclature of medicinal plants

The names of herbs, shrubs, and trees differ in great grammatical diversity. For ease of memorization, they should be categorized by gender.

Feminine gender This includes classical first-declension terms: Belladonna, ae f (belladonna, deadly nightshade) and Urtīca, ae f (nettle). Words of Greek origin ending in -ë present a special challenge: Aloë, ës f (aloe) and Hippophaë, ës f (sea buckthorn).

Masculine and neuter gender The masculine gender is represented by the plant Leonūrus, i m (motherwort). The neuter gender includes Hyperĭcum, i n (St. John's wort) and Rheum, i n (rhubarb). The two-word botanical name Helichrysum arenarium, i n (dwarf everlasting) also belongs to the neuter gender.

> Important: The noun Crataegus, i f (hawthorn) is an exception. Despite the ending -us, which is typical for the masculine gender, grammatically this word is feminine.

Test your knowledge on this topicTasks from the "Latin Language" course bank — instant answers and explanations.

Terminology of alcohols and oils

A separate lexical subgroup consists of terms used to designate solvents and oil bases.

Medical alcohol is translated as spirĭtus, us m. Note that this is a fourth-declension noun. The adjective spirituosus, a, um (alcoholic, spirituous) is formed from it.

The adjective rectificatus, a, um (rectified, purified) regularly appears in prescription formulas. Traditionally, it is used in strict grammatical combinations with the word spirĭtus or as part of the term oleum Terebinthĭnae (oil of turpentine).

Another important name is Oleum Ricĭni (castor oil). Here, the base word oleum, i n (oil) governs the noun Ricĭnus, i m (castor oil plant) in the genitive case.

Frequency stems: spelling of -phyll-

Special frequency stems carrying information about the origin of a drug regularly appear in medication names. One of the key orthographic elements is the stem -phyll-.

It originates from the Ancient Greek word phyllon, which translates as "leaf". Knowing this etymology helps avoid errors in spelling herbal remedies. Classical examples of using this root are Diprophyllinum (diprophylline) and Euphyllinum (aminophylline).

Briefly: answers to topical questions

What frequency stems are used to denote penicillin antibiotics?

To denote penicillin antibiotics, the frequency stems -cillin- and -cillinum (-cillin) are used. They indicate antibiotics of the penicillin group.

Which frequency stems indicate the analgesic (pain-relieving) effect of a drug?

Several specific frequency stems indicate the pain-relieving and analgesic effect of a medicinal product.

  • -dol- — denotes pain, indicates a pain-relieving and analgesic effect (for example, in the drug Antidol).
  • -alg- — is of Greek origin, denotes pain, and indicates a pain-relieving effect (for example, Exalgin).
  • -adolum (-adol, -adol) — is used as a general stem to denote analgesics (pain relievers).
How to memorize

It is easy to remember the exception Crataegus (hawthorn — feminine) if you know the basic rule of Latin botany: the names of all trees and shrubs are feminine because they "bear fruit", meaning they perform a maternal function. Even if their ending (-us) visually points to the masculine gender.

Class and exam questions

To which declension does the Latin word denoting alcohol belong?

The word alcohol is translated as spirĭtus. This is a masculine noun belonging to the fourth declension (spirĭtus, us m).

How to correctly translate Oleum Ricini into Russian?

The term Oleum Ricĭni translates as castor oil.

Does the word Cacao change by case?

No, the name Cacao is an indeclinable noun in Latin and retains its form in any case.

Something unclear? Ask the AIThe AI tutor has reviewed the material on the topic "Names of Drugs and Plants" and will explain it in simple terms.

What else to study on this topic

  • Declension of Greek nouns ending in -e (Aloë, Hippophaë)
  • Grammatical agreement of the adjective rectificatus with nouns of different genders
  • Features of fourth-declension noun declension using spirĭtus as an example
  • Principles of constructing two-word botanical terms (Helichrysum arenarium)

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