English Reference
adjective · noun

biological

adj. · n.
US /ˌbaɪəˈɫɑdʒɪkəɫ/ UK /bˌaɪəlˈɒdʒɪkəl/ bi·o·log·i·cal

  1. 01 B2 Upper Intermediate Science

    adj.relating to living things like plants, animals, and the way they function.

    adj.of or relating to biology and the study of living organisms.

    Simple

    The scientists are studying the biological effects of the new medicine on mice.

    In context

    The researchers documented the biological processes that allow certain deep-sea organisms to survive under extreme pressure without sunlight.

    Usage

    Usually placed before the noun.

  2. 02 B2 Upper Intermediate

    adj.related to someone by birth or blood, rather than by law or adoption.

    adj.related by genetic consanguinity, specifically used to distinguish birth parents from adoptive or step-parents.

    Simple

    She decided to search for her biological parents when she turned eighteen.

    In context

    The legal dispute raised complex questions about the rights of biological fathers in cases where the child was conceived through anonymous donation.

    Usage

    Commonly used in phrases like 'biological parents' or 'biological clock'.

  3. 03 B2 Upper Intermediate British English

    adj.a type of soap for clothes that uses natural helpers to remove stains.

    adj.containing enzymes to assist in the breakdown of organic stains during the laundering process.

    Simple

    You should use biological washing powder to get those grass stains out of your jeans.

    In context

    The manufacturer recommends using a biological detergent for protein-based stains, though it may irritate sensitive skin.

    Usage

    Commonly used to describe laundry detergent.

    non biological
  4. 04 C2 Proficiency TechnicalFormal Medicine

    n.a medicine or product made from living cells or organisms.

    n.a therapeutic product, such as a vaccine or toxin, derived from a living source rather than through chemical synthesis.

    Simple

    The pharmacy stocks several biologicals used to treat rare immune diseases.

    In context

    The regulatory agency implemented stricter oversight for the production of biologicals due to the inherent variability of living cell cultures.

    Usage

    Often used in the plural form 'biologicals'.

    biologicbiopharmaceutical

Usage biological information · biological mechanisms · biological processes

Collections of these naturally occurring phages could provide AI with something extremely valuable: a huge library of real biological solutions.

Phys.org· 16 Aug 2026

Researchers suggest it may be a more natural rhythm, even if the biological reasons for it are still debated.

BBC News· 19 Jul 2026

Etymology tree Proto-Indo-European *gʷeyh₃-der. Ancient Greek βίος (bíos) Proto-Indo-European *leǵ- Ancient Greek λόγος (lógos) Proto-Indo-European *-h₂ Proto-Indo-European *-éh₂ Proto-Indo-European *-i-eh₂ Proto-Hellenic *-íā Ancient Greek -ῐ́ᾱ (-ĭ́ā) Ancient Greek -λογῐ́ᾱ (-logĭ́ā)bor. New Latin -logia New Latin biologialbor. English biology English -ical English biological From biology + -ical.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Level B2 · Upper Intermediate
Frequency Common
Updated