nosto-, nost- +

(Greek: return home)

nostalgia, nostalgy
1. Longing to return home or to one's native land; homesickness.
2. A mixed feeling of happiness, sadness, and longing when recalling a person, place, or event from the past.
3. Originally a medical term for a severe melancholia caused by protracted absence from home.
4. The pain of longing to return home, to a former time in one’s life, or to familiar people and surroundings; severe home sickness.
5. Etymology: from 1770, "severe homesickness" (considered as a disease), Modern Latin, coined in 1668 by Johannes Hofer as a rendering of German heimweh, from Greek nostos, "homecoming" + algos, "pain, grief, distress". Transferred sense (the main modern one) of "wistful yearning for the past" was first recorded in 1920.

The transferred sense of "wistful yearning for a past or earlier time", was first recorded in D.H. Lawrence's The Lost Girl in 1920.

Chinese Panda bears are homesick for China.
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Homesickness or a strong desire to return to one's home

The pain of longing to return home, to a former time in one’s life, or to familiar people and surroundings; severe home sickness. This illustration suggests that at least one of the Panda bears wants to return to China, its native land.

A nostalgic feeling is considered to be a mixed feeling of happiness, sadness, and longing when recalling a person, place, or event from the past.

nostalgic
1. Characterized by a bittersweet longing for things, people, or situations of the past.
2. A reference to a condition of being homesick; homesickness.
3. Caused by nostalgia; later, affected with nostalgia; that is, "unhappy at being away and longing for familiar things or people".
nostalgically
A descriptive reference to a wistful desire to return in thought, or in fact, to a former time in one's life, to one's home or homeland, or to one's family and friends; a sentimental yearning for the happiness of a former place or time.
nostologist
One who studies senility; a gerontologist.
nostology, nostologic
1. The study of the senile stages of an organism or race of organisms.
2. The study of senility, gerontology, and geriatrics.

Based on the idea that some aspects of "later life [senility] is somewhat like returning to early years".

nostomania
1. An exaggerated form of nostalgia.
2. An intense homesickness or an irresistible urge to return home.
3. An overwhelming desire to return home or to go back to familiar places.
4. Homesickness as an illness.
nostomaniac
Someone who has an irresistible or overwhelming desire to return home or go back to familiar places.
nostopathy
Rarely used. A mental illness whereby the subject has a fear of returning to familiar places.
nostophobia
An irrational fear of returning to one's home.
nostos
A homecoming, applied specifically to the homeward journeys of Odysseus and the other heroes of Troy.

Related "home; house" word units: domo-; ecdemo-; eco-.