The noun (Substantiv/Nomen) Psychologe is masculine in German. Therefore, the correct definite article in the nominative singular is der. So, you say: der Psychologe.
(psychologist)
Eine Person, die Psychologie studiert hat und beruflich psychologische Beratung oder Therapie anbietet.
A person who has studied psychology and professionally offers psychological counseling or therapy.
Ich gehe zu einem Psychologen, um meine Probleme zu besprechen. Der Psychologe hat mir sehr geholfen.
I am going to a psychologist to discuss my problems. The psychologist helped me a lot.
German grammatical gender can be tricky at first, as it doesn't always seem logical - like with the neuter 'das Mädchen' (the girl). But here's the good news: Even though you won't find a rule for every word and some things just need to be memorized, there are quite a few helpful patterns and rules! These are real guideposts and can make your life significantly easier. So it's definitely worth knowing them!
Nouns ending in -ant are usually masculine. Common in words of Latin/French origin, often describing people or technical/scientific terms
Nouns ending in -ast are usually masculine. Usually found in scientific or technical terms, often from Greek/Latin origins
Nouns ending in -ich are usually masculine. Common Germanic suffix, often in everyday vocabulary and adjective-derived nouns
Nouns ending in -ig are usually masculine. Germanic suffix forming nouns from adjectives or verbs, often describing containers or enclosed spaces
Nouns ending in -ling are usually masculine. Forms nouns describing people or things with certain characteristics, often with diminutive or derogatory meaning
Nouns ending in -or are usually masculine. Latin origin, typically describing machines, devices, or professional roles
Nouns ending in -us are usually masculine. Latin/Greek origin, common in scientific, academic, and cultural terms
Strong Verb Nouns: Derived from strong verbs, describing the action itself or its result are usually masculine. Very reliable rule in German
Examples:
Cars: Car brands and models are generally masculine in German
Examples:
Currency: Most currency names are masculine, except for a few notable exceptions
Days, Months, and Seasons: These temporal nouns are consistently masculine
Male Persons: Nouns referring to male individuals are masculine
Examples:
Mountains and Mountain Ranges: Most mountain names are masculine, except for specific ranges
Non-German Rivers: Rivers outside German-speaking countries are typically masculine
Nouns ending in -gang are usually masculine. Typically describing paths or processes
Examples:
Nouns ending in -mut are usually masculine. Typically describing states or qualities
Examples: