Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† pēlămis, ĭdis, and pēlamys, ydis, f., = πηλαμις and πηλαμύς, a young tunnyfish (before it is a year old; afterwards called thynnus), Plin. 9, 15, 18, § 47; 32, 11, 53, § 146; Juv. 7, 120.