V. S. Apte, The Practical Sanskrit–English Dictionary. Look up any word of the Gita in Devanagari, IAST or Harvard-Kyoto, or browse the headwords letter by letter.
Entry शैशिर
शैशिरśaiśiraa.(-री f.) [शिशिर-अण्]
(-रीFeminine) शिशिर-अण्
Belonging to the cold or dewy (शिशिर) season; यस्य वै शैशिरे काले तडागे सलिलं भवेत् Mb.13.58.13.
Icy, covered with ice (हिममय); ततोऽहं वचनात्तस्य गिरिमारुह्य शैशिरम् Mb.3.167.15.