gelicidium

Frigere (φρίξαι) means to be cold, in opp. to calere, Cic. Fam. viii. 8. Auct. Her. iv. 15. Sen. Ir. ii. 18; whereas algere (ἀλγεῖν) means to feel cold, in opp. to æstuare. Cic. Tusc. ii. 14, 34. Sen. Ir. iii. 12. Plin. H. N. xvii. 26. 2. Algidus denotes cold, as an unpleasant chill; alsus, as a refreshing coolness. 3. Frigidus denotes a moderate degree of coldness, in opp. to calidus; whereas gelidus means on the point of freezing, in opp. to fervidus. 4. Frigus denotes, objectively, cold in itself, which attacks a man, and leaves him; whereas frigedo denotes cold, subjectively, as the state of a man attacked by cold, which begins and ends; it is an antiquated word which has become obsolete by the general use of frigus. 5. Gelu, gelus, gelum, (γλοία) denote, like κρύος, cold that produces ice; gelicidium, like κρυμός, a single attack of frost, a frosty night; and glacies, like κρύσταλλος, its effect, ice. (iii. 89.)